Increase the timeout for creation of feature group (#294)

Issue #, if available:

Description of changes:
Sometimes creation of feature group takes more than 10 minutes causing canary to Fail. SoIncrease the timeout from 20 to 30 for creation of feature group. 

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Author: Gajam-Anurag

test/e2e/tests/test_feature_group.py

@@ -38,7 +38,7 @@
 FEATURE_GROUP_STATUS_CREATING = "Creating"
 FEATURE_GROUP_STATUS_CREATED = "Created"
 # longer wait is used because we sometimes see server taking time to create/delete
-WAIT_PERIOD_COUNT = 20
+WAIT_PERIOD_COUNT = 40
 WAIT_PERIOD_LENGTH = 30
 STATUS = "status"
 RESOURCE_STATUS = "featureGroupStatus"