Updated method names for Org CLI.

Updated the names for some of the existing methods of the Org CLI class
to match their corresponding command line naming format. Therefore,
`add_computeresource` became `add_compute_resource` and etc.
More additions to CLI smoke test suite.

Tests now create a Capsule and use it when creating a HostGroup. Also,
host groups are now created by specifying the Puppet environment and
other attributes.
Remove code for unpacking server responses

Formerly, some server responses were in this format:

    {'entity_name': {...}}

And some server responses were in this format:

    {...}

Bugzilla bug 1087372 deals with this issue. Remove the code that allowed the
test client to deal with either type of response, as only the latter type of
response is now expected.
Merge pull request #1070 from omaciel/still-smoking

Still smoking
Merge pull request #1071 from Ichimonji10/unpack-response

Remove code for unpacking server responses