Fix variable error for nova --service-type

When running 'nova' with '--service-type' option, it raises an variable
error.

$ nova --service-type compute list
ERROR: local variable 'os_compute_api_version' referenced before
assignment

When '--service-type' option is given, the default value of
'os_compute_api_version' does not apply.

Change-Id: I19554756e8eb56e3a5984ed3078137af9687f986
Closes-bug: 1315368
Add filtering by service to hosts list command

This commit adds --service-name option to host-list command allowing
user to filter hosts by service.

DocImpact
Closes-Bug: 1224763
Change-Id: Ic67deb3af7ddbe23c14fa38ae180d43ab484b78f
Updated from global requirements

Change-Id: I6ccf81a6c605b21946cfcebf817fc1b25f23cae6
Merge "Fix variable error for nova --service-type"
Merge "Updated from global requirements"
Merge "Add filtering by service to hosts list command"
Add destination and also parameters to nova backup CLI and request.