Adds changes for post-icehouse instack version

Steps to create the virtual-power-key and copy the
virt answers file are no longer needed.
Older versions of the roles are copied to an
icehouse directory.

Change-Id: I5782d27b0ed5f20bf79570945445342e21176fa3
(cherry picked from commit 1da7669fe46749d33ff88c49233f8208ba9c977d)
Removes instack-common.yml playbook to restore order

The previous commit used an include that changed the order
of the playbooks.

Change-Id: Ifc03e4922f2f5e5ab3f510854e74e4b28f96743e
(cherry picked from commit 55d6e40ce0189f80fc238caeeb4a9234570d26db)