Remove 55672 from reserved ports

Remove rabbitmq 55672 from reserved ports
as it is not being used in rabbitmq v3.0+
and change 55672 to 15672 in zabbix files

Change-Id: Ie18b6a838358192f6cd0ed9c07d5de66002da684
Closes-Bug: 1393407
(cherry picked from commit 76b2d666f6272dfbfdabcc252d55d98be8a1f900)
Merge "Remove 55672 from reserved ports" into stable/5.1