Fix for "Connection activation failed" Error on bridge interface.

[FarooqAbdulla02]

This patch has updated code to fix the issue "Connection activation failed: No suitable device found for this connection" of a bridge interface.

[FarooqAbdulla02]

Test results:
bridge_interface.tar.gz

[root@ltcden4-lp2-test net]# avocado run bridge.py -m bridge.py.data/bridge.yaml --max-parallel-tasks=1
JOB ID : 9581a55324672f282d22e212c17b1476ef92123d
JOB LOG : /tmp/faroq/avocado-fvt-wrapper/results/job-2024-04-15T05.13-9581a55/job.log
(1/3) bridge.py:Bridging.test_bridge_create;run-77f4: STARTED
(1/3) bridge.py:Bridging.test_bridge_create;run-77f4: PASS (0.02 s)
(2/3) bridge.py:Bridging.test_bridge_run;run-77f4: STARTED
(2/3) bridge.py:Bridging.test_bridge_run;run-77f4: PASS (5.55 s)
(3/3) bridge.py:Bridging.test_bridge_delete;run-77f4: STARTED
(3/3) bridge.py:Bridging.test_bridge_delete;run-77f4: PASS (0.27 s)
RESULTS : PASS 3 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML : /tmp/faroq/avocado-fvt-wrapper/results/job-2024-04-15T05.13-9581a55/results.html
JOB TIME : 28.22 s

YAML file:
[root@ltcden4-lp2-test net]# cat bridge.py.data/bridge.yaml
interfaces: 'env5 env6'
peer_ip: 103.10.10.102
host_ip: 103.10.10.94
netmask: 255.255.255.0
bridge_interface: "br0"
peer_interface: env5
peer_public_ip: xxxxxxx
peer_password: xxxxx
user_name: root

[abdhaleegit]

LGTM