Port extended_ips/extended_ips_mac extension to V2.1

This patch port extended_ips/extended_ips_mac extension to V2.1

There are difference between V2 and V3 server show/index &
server address index API response listed below-

'address' field of V2->V3 API response-
"OS-EXT-IPS:type" -> "type"
"OS-EXT-IPS-MAC:mac_addr" -> "mac_addr"

Reverting those attribute same as V2 to work with V2.1

Closes-Bug: #1368495
Partially implements blueprint v2-on-v3-api

Change-Id: I44902b0402115d1b6e833975e6c2f020ac5ab7c3
Merge "Port extended_ips/extended_ips_mac extension to V2.1"