Additional ssh tests with tempest

The run_ssh option is used on the default 'false',
 so several test case and validation step was disabled.

It was disabled because:
 * Admin password injection with the cirros image is not supported.
  (We 'cannot' inject password/shadow to a ram disk.)
 * In the current system setup floating IP is required for connecting
   with neutron

The run_ssh boolean option will be removed from tempest, it will be replaced
with ssh_connect_method and ssh_auth_method.

Since using a floating ip with nova flat network is not required in these
case, the 'fixed'/private IPs (ssh_connect_method) will be used with nova network
, and we will use the 'floating' IPs with neutron when the NAMESPACES
are enabled(default).

The default value of ssh_auth_method is keypair, it works in both cases.

Change-Id: I3d47811d801985687526749a430ed6db64224f99
Merge "Additional ssh tests with tempest"