[BGP] Remove octbr from network-values

With BGP, octavia provider network should only be deployed on networker
nodes and to do this, it has to be removed from NNCP configuration.

OSPRH-10768

Author: eduolivares

roles/ci_gen_kustomize_values/templates/bgp_dt01/network-values/values.yaml.j2

@@ -132,9 +132,7 @@ data:
         "forceAddress": false,
         "ipMasq": true,
         "hairpinMode": true,
-{%  if network.network_name == "octavia" %}
-        "bridge": "octbr",
-{%  elif network.network_name == "ctlplane" %}
+{%  if network.network_name == "ctlplane" %}
         "bridge": "ospbr",
 {%  else %}
         "bridge": "{{ network.network_name }}",