Move network trunk commands from python-neutronclient

Network trunk commands originally were added to python-neutronclient,
although we can long consider these operations core Networking operations.
This patch is not a blind copy but also changes the original code to use
openstacksdk python bindings instead of the binding code in
python-neutronclient as that is already deprecated.

Change-Id: Ic4bc35c296a95d5dae92e9fc1cab3a3fa8f103cd
Related-Bug: #1999774

Author: elajkat

.zuul.yaml

@@ -108,6 +108,7 @@
         neutron-tag-ports-during-bulk-creation: true
         neutron-conntrack-helper: true
         neutron-ndp-proxy: true
+        q-trunk: true
       devstack_localrc:
         Q_AGENT: openvswitch
         Q_ML2_TENANT_NETWORK_TYPE: vxlan

doc/source/cli/command-objects/network-trunk.rst

@@ -0,0 +1,16 @@
+=============
+network trunk
+=============
+
+A **network trunk** is a container to group logical ports from different
+networks and provide a single trunked vNIC for servers. It consists of
+one parent port which is a regular VIF and multiple subports which allow
+the server to connect to more networks.
+
+Network v2
+
+.. autoprogram-cliff:: openstack.network.v2
+   :command: network subport list
+
+.. autoprogram-cliff:: openstack.network.v2
+   :command: network trunk *