Add enable_tunneling to swift storage metadata
Add enable_tunneling to swift storage metadata

Add the enable_tunneling option to the neutron-openvswitch-agent
metadata for the swift storage template. If not preset, this option is
left blank in the openvswitch plugin configuration plugin. This causes
the service to fail to start because a blank value is not permissible
for a boolean option.

Change-Id: Ieadcdab295913121bd00dbd25e4245024bc2240f

dprince/tripleo-heat-templates,rdo-management/tripleo-heat-templates,redhat-openstack/tripleo-heat-templates,bcrochet/tripleo-heat-templates,wyg3958/tripleo-heat-templates,trozet/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,trozet/tripleo-heat-templates,trozet/opnfv-tht,redhat-openstack/tripleo-heat-templates,wyg3958/tripleo-heat-templates,trozet/opnfv-tht,openstack/tripleo-heat-templates,bcrochet/tripleo-heat-templates,trozet/opnfv-tht,bcrochet/tripleo-heat-templates,rdo-management/tripleo-heat-templates