mitaka: stop apache2 before enabling haproxy
mitaka: stop apache2 before enabling haproxy

In mitaka, barbican runs behind apache2 and listens on 9311;
stop apache2 before starting haproxy.
apache2 is restarted later from barbican-server-setup.sh after
updating secondary port in apache barbican conf file

Change-Id: I218d8611e6d55dfd6a0d703a2a295e3099f3800c
Partial-Bug: #1582932

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils