Port fping extension to v3 API Part 2

Ports the fping extensions and the corresponding unittests to the
v3 framework.

Partially implements blueprint nova-v3-api

Change-Id: I1db2a91f7e579356a77a196c46307492dd36e3d1
Merge "Port fping extension to v3 API Part 2"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp