Add an index tag on neutron network resources

When using the multiple nic-config templates in THT
and in tripleo-ansible the ordering of networks in
the network_data file matters.

Add a a tag 'tripleo_net_idx' to neutron resources
to keep track of the ordering.

Depends-On: https://review.opendev.org/772795
Partial-Implements: blueprint network-data-v2-ports
Change-Id: I0d39ea713ce1201b60f3def69f453792e402eb33

network/network.j2

@@ -178,6 +178,7 @@ resources:
           - {get_param: {{network.name}}NetValueSpecs}
           - {'mtu': {get_param: {{network.name}}Mtu}}
       tags:
+        - tripleo_net_idx={{network.idx}}
         - tripleo_vip={{network.vip|default(false)}}
 {%- if network.service_net_map_replace|default('') %}
         - tripleo_service_net_map_replace={{network.service_net_map_replace}}

tools/process-templates.py

@@ -158,6 +158,11 @@ def process_templates(template_path, role_data_path, output_dir,
         if network_data is None:
             network_data = []
 
+    # Set internal network index key for each network, network resources
+    # are created with a tag tripleo_net_idx
+    for idx, net in enumerate(network_data):
+        network_data[idx].update({'idx': idx})
+
     j2_excludes = {}
     j2_excludes_path = os.path.join(template_path, 'j2_excludes.yaml')
     if os.path.exists(j2_excludes_path):