Fix salt rabbitmq module incompatibility with rabbitmq-server 3.8+

It was an issue with check regex against newer RabbitMQ version in
check_password function in rabbitmq module.
Now it uses rabbitmq_custom module instead of rabbitmq for
check_password function.

PROD-35125

Change-Id: Icead56cbc0ae9f52e53f3978636a0d687dd92942
4 files changed