Use right class method in IP availability tests
Use right class method in IP availability tests

This should have been skip_checks. Spotted when dealing with
fix for bug 1563883, argh.

Change-Id: If609c285c2363967aba91a8ae1560d99391654d9
Related-bug: 1563883
(cherry picked from commit 2b0ce0ba8bf6abeb62654a00c12cfaad89f86e7c)

bigswitch/neutron,sebrandon1/neutron,eayunstack/neutron,eayunstack/neutron,mahak/neutron,cloudbase/neutron,mahak/neutron,cloudbase/neutron,igor-toga/local-snat,openstack/neutron,huntxu/neutron,sebrandon1/neutron,noironetworks/neutron,huntxu/neutron,noironetworks/neutron,openstack/neutron,openstack/neutron,igor-toga/local-snat,mahak/neutron,bigswitch/neutron