trim compute smoke tag

Delete the following from the compute smoke tag, these are more
advanced things that should just be caught by full Tempest testing.

 - resize operations

 - all actions except hard reboot

 - all use of proxy APIs (image / volume)

Trim the rest of the tests if it looks like they are doing very
related activities, which means we'll typically only have one or two
smoke tests per class.

Change-Id: Ib91db7204848e8c0892f43251e8937dec6b23232
11 files changed