[config reload]: Restart mux container (sonic-net#1401)

* Add `mux` to list of services to reset fail counts and restart after config reload

Signed-off-by: Lawrence Lee <lawlee@microsoft.com>

Author: theasianpianist

config/main.py

@@ -755,6 +755,7 @@ def _reset_failed_services(config_db):
         'hostname-config',
         'interfaces-config',
         'lldp',
+        'mux',
         'nat',
         'ntp-config',
         'pmon',
@@ -787,6 +788,7 @@ def _restart_services(config_db):
         'ntp-config',
         'rsyslog-config',
         'swss',
+        'mux',
         'bgp',
         'pmon',
         'lldp',