Add support for managing network segments

Adds a module to manage Neutron network segments where the
segmentation plugin is enabled.

Segments are relatively simple and do not support modification
beyond the name/description, so most attributes are used for
initial segment creation, or filtering results in order to
perform updates.

Depends-On: https://review.opendev.org/c/openstack/ansible-collections-openstack/+/955752
Change-Id: I4647fd96aaa15460d82765365f98a18ddf2693db

meta/runtime.yml

@@ -51,6 +51,7 @@ action_groups:
     - lb_pool
     - loadbalancer
     - network
+    - network_segment
     - networks_info
     - neutron_rbac_policies_info
     - neutron_rbac_policy