Create ~/.my.cnf with root user/password

50-mysql-users and 60-mysql-secure depend on ~/.my.cnf
existing with the correct root password.
This needs to be created as part of the install so that
os-refresh-config will work post install.
On a re-image this may not exist so try with no password
or with /mnt/state/root/metadata.my.cnf
Change-Id: If984c45b5745997a2ec63d9c90d4cf4c105964d2
Add pacemaker and corosync as tripleo elements

corosync+pacemaker is working approach to handle active/passive
cluster resources.

It will be usefull atleast for:
1. neutron l3 agent
2. neutron lbaas agent
3. vip interface for haproxy
4. qpid ha setup

Related to blueprint tripleo-icehouse-ha-production-configuration

Change-Id: I660d8a4a8e3a4eacf5e2b63d323fa5b575316cdd
Merge "Add pacemaker and corosync as tripleo elements"
Merge "Create ~/.my.cnf with root user/password"