api-ref: Example verification for os-interface.inc
api-ref: Example verification for os-interface.inc

Add an example creating an interface with net_id
and fixed_ips in addition to an example with port_id.
The example and the sample test have been added in
I6b2567db82d000e4b1cdf46020ce1b57103c3f46.

Change-Id: Ia71ecf3dd633409f9bb5156c5e68f6bb878eee71
Implements: blueprint api-ref-in-rst

openstack/nova,rajalokan/nova,alaski/nova,rahulunair/nova,alaski/nova,Juniper/nova,hanlind/nova,rahulunair/nova,jianghuaw/nova,openstack/nova,cloudbase/nova,cloudbase/nova,Juniper/nova,klmitch/nova,mahak/nova,gooddata/openstack-nova,vmturbo/nova,klmitch/nova,phenoxim/nova,hanlind/nova,jianghuaw/nova,vmturbo/nova,sebrandon1/nova,rajalokan/nova,sebrandon1/nova,gooddata/openstack-nova,phenoxim/nova,Juniper/nova,Juniper/nova,mikalstill/nova,mahak/nova,mikalstill/nova,rajalokan/nova,cloudbase/nova,rahulunair/nova,vmturbo/nova,gooddata/openstack-nova,klmitch/nova,klmitch/nova,bigswitch/nova,jianghuaw/nova,hanlind/nova,openstack/nova,vmturbo/nova,sebrandon1/nova,mikalstill/nova,rajalokan/nova,jianghuaw/nova,bigswitch/nova,mahak/nova,gooddata/openstack-nova