Add basic timing support

Add support for novaclient's --timings option.  Due to the transition
to cliff for all data output a psuedo-command Timings is created
to handle output formatting.

TODO:
* make get_timings() modular for all plugged-in clients
* extract format and colums options from previous command so
  we can not hard-code '-f table'

Change-Id: I7f1076b7a250fba6a8b24b2ae9353a7f51b792b2
Change volume create --volume-type to --type

This makes it consistent with the other --type options in OSC.  Also
add a few more volume_create tests.

Change-Id: I50ef927932cabf157ecdfd6c4faa1914b4fdf413
Merge branch 'server-image-create-fix' into dt-test
Merge branch 'image-set-fix' into dt-test
Merge branch 'timings' into dt-test
Merge branch 'volume-type-fix' into dt-test
Merge branch 'fix-logging' into dt-test
Merge branch 'new-session' into dt-test
Merge branch 'identity-ec2-tests' into dt-test