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

.zuul.yaml

@@ -48,6 +48,7 @@
         designate: true
         neutron-dns: true
         neutron-trunk: true
+        neutron-segments: true
       zuul_copy_output:
         '{{ devstack_log_dir }}/test_output.log': 'logs'
       extensions_to_txt: