Fix killing of Rabbit beam process for OCF scripts

W/o this patch, 'killall beam' commands kill all instances
of rabbitmq including the one for Murano.

The solution is to use kill_rmq_and_remove_pid()
procedure to kill it by pidfile instead.

Closes-bug: #1400670

Change-Id: Ic8bb0b4ea22df22784bdb8fca0ccd0f2cb02bc9e
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>