LVM storage should be deployed before Controller, add temporary db node for HA

This commit reorders the deployment of controller nodes and LVM storage nodes.

In addition, it enables a separate DB node for HA, since the HA Controller node
has not yet enabled the database service. This node will go away once HA gets
the db service enabled.
Merge pull request #77 from sseago/layout_tweaks

LVM storage should be deployed before Controller, add temporary db node ...