Recent changes introduced unittest dependency on a local redis server

[danrue]

Before 2ded14f ("Add unit tests for test case import and regression"), unittests could be run without a redis server. 3 new tests introduced in the above commit fail if redis is not running:

======================================================================
ERROR: test_new_failure (utils.kci_test.tests.test_tests.TestTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/drue/src/kernelci/kernelci-backend/app/utils/kci_test/tests/test_tests.py", line 104, in test_new_failure
    ret, regr_ids = utils.kci_test.regressions.find(group_id, db=self._db)
  File "/home/drue/src/kernelci/kernelci-backend/app/utils/kci_test/regressions.py", line 167, in find
    with redis.lock.Lock(redis_conn, lock_key, timeout=5):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 84, in __enter__
    self.acquire(blocking=True)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 111, in acquire
    if self.do_acquire(token):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 121, in do_acquire
    if self.redis.setnx(self.name, token):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/client.py", line 1196, in setnx
    return self.execute_command('SETNX', name, value)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/client.py", line 673, in execute_command
    connection.send_command(*args)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 610, in send_command
    self.send_packed_command(self.pack_command(*args))
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 585, in send_packed_command
    self.connect()
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 489, in connect
    raise ConnectionError(self._error_message(e))
ConnectionError: Error 111 connecting to localhost:6379. Connection refused.

======================================================================
ERROR: test_no_regression (utils.kci_test.tests.test_tests.TestTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/drue/src/kernelci/kernelci-backend/app/utils/kci_test/tests/test_tests.py", line 162, in test_no_regression
    ret, regr_ids = utils.kci_test.regressions.find(group_id, db=self._db)
  File "/home/drue/src/kernelci/kernelci-backend/app/utils/kci_test/regressions.py", line 167, in find
    with redis.lock.Lock(redis_conn, lock_key, timeout=5):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 84, in __enter__
    self.acquire(blocking=True)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 111, in acquire
    if self.do_acquire(token):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 121, in do_acquire
    if self.redis.setnx(self.name, token):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/client.py", line 1196, in setnx
    return self.execute_command('SETNX', name, value)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/client.py", line 673, in execute_command
    connection.send_command(*args)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 610, in send_command
    self.send_packed_command(self.pack_command(*args))
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 585, in send_packed_command
    self.connect()
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 489, in connect
    raise ConnectionError(self._error_message(e))
ConnectionError: Error 111 connecting to localhost:6379. Connection refused.

======================================================================
ERROR: test_tracking_regression (utils.kci_test.tests.test_tests.TestTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/drue/src/kernelci/kernelci-backend/app/utils/kci_test/tests/test_tests.py", line 225, in test_tracking_regression
    ret, regrs = utils.kci_test.regressions.find(group_id, db=self._db)
  File "/home/drue/src/kernelci/kernelci-backend/app/utils/kci_test/regressions.py", line 167, in find
    with redis.lock.Lock(redis_conn, lock_key, timeout=5):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 84, in __enter__
    self.acquire(blocking=True)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 111, in acquire
    if self.do_acquire(token):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/lock.py", line 121, in do_acquire
    if self.redis.setnx(self.name, token):
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/client.py", line 1196, in setnx
    return self.execute_command('SETNX', name, value)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/client.py", line 673, in execute_command
    connection.send_command(*args)
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 610, in send_command
    self.send_packed_command(self.pack_command(*args))
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 585, in send_packed_command
    self.connect()
  File "/home/drue/src/kernelci/kernelci-backend/app/venv/lib/python2.7/site-packages/redis/connection.py", line 489, in connect
    raise ConnectionError(self._error_message(e))
ConnectionError: Error 111 connecting to localhost:6379. Connection refused.

Running a local redis server resolves this issue, but it should not be a requirement for running local unit tests.