Always set NetworkDeploymentActions to its default
Always set NetworkDeploymentActions to its default

There are instances users use ``NetworkDeploymentActions`` to
do network configuration during update, but just drop the
parameter for subsequent updates. This sometimes results in
network configuration changes in existing nodes and disruptions.
Let's always set them to defaults unless overridden explicitly.

Change-Id: Ibe7925e4ee568d3d45e138d543b6d7064a8503a3
Related: https://bugzilla.redhat.com/1928055

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates