Enhance CLI commands for usability

Current nova commands such as suspend, pause, resume, pause take a single server output and does not show any acceptance of command. This blueprint is to allow acceptance of more than one server and allow to show output message when the
request from the command has been accepted.

For example,

Current Scenario :

1) No acceptance output

ritesh@Cloud58:~$ nova suspend test2

2) Accepting more than one server

ritesh@Cloud58:~$ nova suspend test test2

Expected Scenario :

1) ritesh@Cloud58:~$ nova suspend test
    Request to suspend server test has been accepted.

2) ritesh@Cloud58:~$ nova suspend test test2
    Request to suspend server test has been accepted.
    Request to suspend server test2 has been accepted.

Following commands will have impact

pause
suspend
resume
shelve
shelve-offload
unshelve
unpause