add ec2 tests

Change-Id: Iced3eb8ca81c3b067496c3683f322b6e1dedec2a
use ksc.session

* Remove restapi.py
* Change object-store commands to use keystoneclient.session.Session
* Update tests

Change-Id: I47ec63291e4c3cf36c8061299a4764f60b36ab89
Merge branch 'compute-test-fix' into dt-test
Merge branch 'help-cleanup' into dt-test
Merge branch 'identity-ec2-tests' into dt-test