loadbalancer: manage HAproxy on MASTER node

When disabling manage_service for HAProxy, keepalived can't start it at
all. So we need to manage HAproxy service, at least for MASTER node.
If a failover occured before and the node is no more MASTER, the catalog
will just send out warnings without breaking actual binding.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
loadbalancer: don't manage HAproxy service but allow it to start

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge pull request #454 from enovance/fix-haproxy

loadbalancer: manage HAproxy on MASTER node