Add 'role_tags' to network_config schema

Some of the network config templates shipped with tripleo-ansible
uses the `role_tags` in jinja2. For example:
  roles/tripleo_network_config/templates/multiple_nics/multiple_nics.j2

 elif network in role_networks or 'external_bridge' in role_tags

This change add's 'role_tags' to the network_config schema for
baremeteal deployment definition.

Closes-Bug: #2039008
Change-Id: I15e7e03c40d9334a665f7063df90bcddcccabfd4

tripleo_ansible/ansible_plugins/module_utils/baremetal_deploy.py

@@ -65,7 +65,11 @@ _NETWORK_CONFIG_SCHEMA = {
         },
         'dns_search_domains': {'type': 'string'},
         'bond_interface_ovs_options': {'type': 'string'},
-        'num_dpdk_interface_rx_queues': {'type': 'integer'}
+        'num_dpdk_interface_rx_queues': {'type': 'integer'},
+        'role_tags': {
+            'type': 'array',
+            'items': {'type': 'string'}
+        }
     },
     'additionalProperties': False
 }

tripleo_ansible/ansible_plugins/modules/tripleo_generate_inventory_network_config.py

@@ -113,6 +113,12 @@ options:
               - Number of Rx Queues required for DPDK bond or DPDK ports
             type: int
             default: 1
+          role_tags:
+            description:
+              - Role tags used in jinja2 NIC config templates. For example
+                the tag 'external_bridge' is used in multiple NIC's templates.
+            type: list
+            default: []
   hostname_role_map:
     description:
       - Mapping of instance hostnames to role name

tripleo_ansible/tests/modules/test_tripleo_generate_inventory_network_config.py

@@ -66,6 +66,7 @@ class TestTripleoGenerateInventoryNetworkConfig(tests_base.TestCase):
                         'neutron_physical_bridge_name': 'br-ex',
                         'neutron_public_interface_name': 'nic1',
                         'num_dpdk_interface_rx_queues': 1,
+                        'role_tags': [],
                         'tripleo_network_config_update': False,
                         'tripleo_network_config_os_net_config_mappings': {},
                         'tripleo_network_config_template': '/foo/template.j2'}
@@ -83,6 +84,7 @@ class TestTripleoGenerateInventoryNetworkConfig(tests_base.TestCase):
                         'neutron_physical_bridge_name': 'br-ex',
                         'neutron_public_interface_name': 'nic1',
                         'num_dpdk_interface_rx_queues': 1,
+                        'role_tags': [],
                         'tripleo_network_config_update': False,
                         'tripleo_network_config_template':
                             'templates/net_config_bridge.j2'}},