[RabbitMQ] Make VRRP script more reliable

10 seconds and 1 try is often not enough on huge environments to declare
RabbitMQ non functional. It leads to false positives and traffic drops.
The commit bumps values to make the health check more robust.

Closes-Bug: #PROD-36533
Change-Id: Ie2d9bbc37b1e8cafa3de145cad1d356bce778f00
1 file changed