Adds the following commands:
- "fixed-ip-get <ip_addr>" - displays information about the fixed ip ip_addr
- "fixed-ip-reserve <ip_addr>" - reserves the fixed ip ip_addr
- "fixed-ip-unreserve <ip_addr>" - unreserves the fixed ip ip_addr
Change-Id: I6a5c8b9f7ab359adeb57b86240279649cd421801
Implements: blueprint apis-for-nova-manage