Add the bgp agent type to network agent command

The neutron-dynamic-routing project provides an agent called
neutron-bgp-dragent with type "BGP dynamic routing agent". So we need to
add this option and can avoid using the deprecated neutron CLI e.g. in
[1].

[1] https://docs.openstack.org/ocata/networking-guide/config-bgp-dynamic-routing.html#verify-service-operation

Change-Id: I9af1e09d122806b56b966295817d8d31393e0283
Closes-Bug: 1671040

Author: Jens Rosenboom

openstackclient/network/v2/network_agent.py

@@ -89,10 +89,11 @@ def get_parser(self, prog_name):
         parser.add_argument(
             '--agent-type',
             metavar='<agent-type>',
-            choices=["dhcp", "open-vswitch", "linux-bridge", "ofa", "l3",
-                     "loadbalancer", "metering", "metadata", "macvtap", "nic"],
+            choices=["bgp", "dhcp", "open-vswitch", "linux-bridge", "ofa",
+                     "l3", "loadbalancer", "metering", "metadata", "macvtap",
+                     "nic"],
             help=_("List only agents with the specified agent type. "
-                   "The supported agent types are: dhcp, open-vswitch, "
+                   "The supported agent types are: bgp, dhcp, open-vswitch, "
                    "linux-bridge, ofa, l3, loadbalancer, metering, "
                    "metadata, macvtap, nic.")
         )
@@ -125,6 +126,7 @@ def take_action(self, parsed_args):
         )
 
         key_value = {
+            'bgp': 'BGP dynamic routing agent',
             'dhcp': 'DHCP agent',
             'open-vswitch': 'Open vSwitch agent',
             'linux-bridge': 'Linux bridge agent',