Add support for ansible verbose ssh commands. Use with care.

Change-Id: Id96c2884188807c6528d23858303f1c80dbcc513
Add common-handlers as dependency for tempest package dependencies

Change-Id: I929349a66c163c8134803ed12510d29cb54b5186
Introduce group_vars for Distro-Version

If you group_by  ansible_distribution - ansible_distribution_version|int
these new vars will automatically be read in.  This sets the proper
reboot options for the various distro versions.

Change-Id: Ic58fb21e22110b7017d3f5ed0d79204bf939c49f