ha: Do not pass is-managed / target-role meta when creating resources

We are happy with the default values.
ha: Follow convention for pacemaker resource naming
ha: Delay creation of VIP primitive until we need it

This allows to not mix it with the storage pieces.
ha: Use a notification to start primitive after defining constraints

This will be needed when we do not start pacemaker resources by default
anymore.
Merge pull request #29 from vuntz/ha-convention

Update pacemaker resource names + other conventions for HA