[OVN] Configure public bridge enabled by default

This patch makes the OVN_L3_CREATE_PUBLIC_NETWORK configuration True by
default. This option makes the OVN lib in DevStack create & configure
the external bridge, matching the same behavior from the OVS driver
in DevStack.

Change-Id: Icda53b95fdc3c169ac48a6ec4343c87ba404baa4
Signed-off-by: Lucas Alvares Gomes <lucasagomes@gmail.com>
diff --git a/.zuul.yaml b/.zuul.yaml
index 6484b2a..5bc6a8b 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -468,7 +468,6 @@
         SWIFT_HASH: 1234123412341234
         DEBUG_LIBVIRT_COREDUMPS: true
         NOVA_VNC_ENABLED: true
-        OVN_L3_CREATE_PUBLIC_NETWORK: true
         OVN_DBS_LOG_LEVEL: dbg
       devstack_local_conf:
         post-config:
diff --git a/lib/neutron_plugins/ovn_agent b/lib/neutron_plugins/ovn_agent
index 4af1340..f12e6a4 100644
--- a/lib/neutron_plugins/ovn_agent
+++ b/lib/neutron_plugins/ovn_agent
@@ -95,6 +95,7 @@
 
 # If True (default) the node will be considered a gateway node.
 ENABLE_CHASSIS_AS_GW=$(trueorfalse True ENABLE_CHASSIS_AS_GW)
+OVN_L3_CREATE_PUBLIC_NETWORK=$(trueorfalse True OVN_L3_CREATE_PUBLIC_NETWORK)
 
 export OVSDB_SERVER_LOCAL_HOST=$SERVICE_LOCAL_HOST
 if [[ "$SERVICE_IP_VERSION" == 6 ]]; then