add ec2 tests

Change-Id: Iced3eb8ca81c3b067496c3683f322b6e1dedec2a
Add service catalog commands

'catalog list' and 'catalog show' for Identity v2

Identity v2 only so far.

Change-Id: I9df0dac3d5bb7c18f38a81bd7d29f8119462d3a5
Merge branch 'catalog-commands' into dt-test
Merge branch 'identity-ec2-tests' into dt-test