Merge pull request #744 from skpcharles/master

Chaged the errocode form 400 to 401 in login API
Added default version support if version not exists
Merge remote-tracking branch 'gooru/master'
Merge pull request #745 from parthibane/master

added default version
Changed cassandra keyspace name for search
Merge pull request #746 from parthibane/master

Changed cassandra keyspace name for search
Added source support in authenticate user api.
Merge pull request #747 from sarala0927/master

Added source support in authenticate user api.
improvements on create user with collaborator update API