Add ability to set tags in network modules

This adds the `tags` parameter to the network,
subnet, and router modules.

Change-Id: I704b40c44c733a3d4ec93a95d8efcb7ecf6e2a32
Signed-off-by: Austin Jamias <ajamias@redhat.com>

plugins/modules/network.py

@@ -83,6 +83,11 @@ options:
           Network will use Openstack defaults if this option is
           not provided.
      type: str
+   tags:
+     description:
+       - A list of tags to set on the network
+     type: list
+     elements: str
 extends_documentation_fragment:
 - openstack.cloud.openstack
 '''
@@ -208,7 +213,8 @@ class NetworkModule(OpenStackModule):
         project=dict(),
         port_security_enabled=dict(type='bool'),
         mtu=dict(type='int', aliases=['mtu_size']),
-        dns_domain=dict()
+        dns_domain=dict(),
+        tags=dict(type='list', elements='str'),
     )
 
     def run(self):
@@ -224,6 +230,7 @@ class NetworkModule(OpenStackModule):
         provider_network_type = self.params['provider_network_type']
         provider_segmentation_id = self.params['provider_segmentation_id']
         project = self.params['project']
+        tags = self.params['tags']
 
         kwargs = {}
         for arg in ('port_security_enabled', 'mtu', 'dns_domain'):
@@ -304,6 +311,12 @@ class NetworkModule(OpenStackModule):
                     )
                     changed = True
 
+            if tags is not None:
+                old_tags = self.conn.network.get_tags(net)
+                if set(old_tags) != set(tags):
+                    self.conn.network.set_tags(net, tags)
+                    changed = True
+
             net = net.to_dict(computed=False)
             self.exit(changed=changed, network=net, id=net['id'])
         elif state == 'absent':