Using UTC datetimes in StateManager tests
Using UTC datetimes in StateManager tests

Changed tests to use datetime.utcnow() in tests as every dates are
timezone independent in CloudKitty.

Change-Id: I091ae8ec3465e78052b750bc38a652d997dd9933

stackforge/cloudkitty,openstack/cloudkitty,FNST-OpenStack/cloudkitty,openstack/cloudkitty,muraliselva10/cloudkitty,muraliselva10/cloudkitty,FNST-OpenStack/cloudkitty,stackforge/cloudkitty