python3 compat fixes

Author: cognifloyd

st2auth_keystone_backend/__init__.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from keystone import KeystoneAuthenticationBackend
+from .keystone import KeystoneAuthenticationBackend
 
 __all__ = [
     'KeystoneAuthenticationBackend'

st2auth_keystone_backend/keystone.py

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 import logging
-import httplib
+import http.client
 
 import requests
 
@@ -65,7 +65,7 @@ def authenticate(self, username, password):
             LOG.debug('Authentication for user "{}" failed: {}'.format(username, str(e)))
             return False
 
-        if login.status_code in [httplib.OK, httplib.CREATED]:
+        if login.status_code in [http.client.OK, http.client.CREATED]:
             LOG.debug('Authentication for user "{}" successful'.format(username))
             return True
         else: