Update ironic-multitenant network vairable names
Update ironic-multitenant network vairable names

Community decided to change variables name during development.
This patch updates names for job variables:
IRONIC_ENABLED_NETWORK_DRIVERS --> IRONIC_ENABLED_NETWORK_INTERFACES
IRONIC_NETWORK_DRIVER --> IRONIC_NETWORK_INTERFACE

Change-Id: I030742d24b38a6ceef57df8b0ac9909bb971d6dd

dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config