RabbitMQ element: Move /var/run/rabbitmq

Move creation of the folder /var/run/rabbitmq so that it get's created before
the server is started.

Closes-Bug: #1334235

Change-Id: I0bf2a6ba3bb36c0155752c2de0e2caed25b9a265
Merge "RabbitMQ element: Move /var/run/rabbitmq"