V2.1 server update and rebuild response contain
'OS-EXT-IPS:type' & 'OS-EXT-IPS-MAC:mac_addr' in address field
which are new attributes compared to V2 response for those API.
These new attributes are found during tempest testing by blocking
additional properties in schema -https://review.openstack.org/#/c/156130/
V2.1 must be identical with V2 and must not contain any new attributes in
response. This commit removes these new attributes from V2.1 API.
Partially implements blueprint v2-on-v3-api
Change-Id: Id5b210d7afe5c0a590abcbd42b9ff85b071a5c55