Adding bridge for floating network on bmt nodes

The make floating network accessible a bridge should be added
therefore br-public is added to baremetal network configuration
function.

Floating network is extented due to the fact that 10 available IP
address are not enough in the pool and the error below occurred:

b'tempest.lib.exceptions.Conflict: Conflict with state of target resource'
b"Details: {'type': 'IpAddressGenerationFailure', 'message': 'No more IP addresses available on network 8bd8baff-b7fb-4b38-a9a3-42b797c97f97.', 'detail': ''}"
b''

Related-PROD: PRODX-2342
Change-Id: I0d7f07efe9ad9c640f02cd17549c0c2332225e6f
diff --git a/de/heat-templates/env/bmt402-mstr1-wrkr3-cmp0-gtw0.yaml b/de/heat-templates/env/bmt402-mstr1-wrkr3-cmp0-gtw0.yaml
index 77dc495..654c95d 100644
--- a/de/heat-templates/env/bmt402-mstr1-wrkr3-cmp0-gtw0.yaml
+++ b/de/heat-templates/env/bmt402-mstr1-wrkr3-cmp0-gtw0.yaml
@@ -23,7 +23,7 @@
   ucp_boot_timeout: 1200
   cluster_public_key: ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCp0evjOaK8c8SKYK4r2+0BN7g+8YSvQ2n8nFgOURCyvkJqOHi1qPGZmuN0CclYVdVuZiXbWw3VxRbSW3EH736VzgY1U0JmoTiSamzLHaWsXvEIW8VCi7boli539QJP0ikJiBaNAgZILyCrVPN+A6mfqtacs1KXdZ0zlMq1BPtFciR1JTCRcVs5vP2Wwz5QtY2jMIh3aiwkePjMTQPcfmh1TkOlxYu5IbQyZ3G1ahA0mNKI9a0dtF282av/F6pwB/N1R1nEZ/9VtcN2I1mf1NW/tTHEEcTzXYo1R/8K9vlqAN8QvvGLZtZduGviNVNoNWvoxaXxDt8CPv2B2NCdQFZp
   private_floating_network_cidr: '172.16.49.128/26'
-  private_floating_network_pool_start: '172.16.49.180'
+  private_floating_network_pool_start: '172.16.49.160'
   private_floating_network_pool_end: '172.16.49.190'
   private_floating_network_gateway: '172.16.49.129'
   private_floating_interface: 'enp3s0f1.403'
@@ -62,6 +62,12 @@
             ${PUBLIC_INTERFACE}:
                 id: 403
                 link: $(echo ${PUBLIC_INTERFACE} | cut -d'.' -f1)
+        bridges:
+            br-public:
+                dhcp4: false
+                interfaces:
+                - ${PUBLIC_INTERFACE}
+                - veth-br
                 addresses: [ "${PUBLIC_NODE_IP_ADDRESS}/${PUBLIC_NODE_IP_NETMASK}" ]
     EOF