Support Remaining Server Actions

[carolynvs]

Some actions were accidentally mis-classified as operator only and should be implemented:

• [ ] Add Security Group
• [ ] Remove Security Group
• [ ] Add Fixed IP
• [ ] Remove Fixed IP
• [ ] Add Floating IP
• [ ] Remove Floating IP
• [ ] Force Delete
• [ ] Lock
• [ ] Unlock
• [ ] Pause
• [ ] Pause
• [ ] Restore see http://www.gossamer-threads.com/lists/openstack/dev/38006
• [ ] Shelve see https://ask.openstack.org/en/question/32000/whats-the-difference-between-shelving-vs-shutting-down-an-instance/
• [ ] Unshelve
• [ ] Shelve Offload