Using relative path for personality file in rebuild server test.

Personality files with absolute paths e.g /etc/rebuild.txt breaks on the test
cirros image. This is because cirros has an empty root filesystem.

fixes lp 1187629

Change-Id: I5b2b37224b722686c3163214fbd53227ac9ce49f
Fix SSH host to floating IP from fixed IP

SSH cannot reach to the server, if Tempest node is different from
OpenStack node.
This test case should set floating IP to the server.
This Patche sets floating IP to the server.

Change-Id: Ib38bad9145f51b805142ee26bd02f4f0d5eee2ee
Fixes: bug #1199202
Merge "Using relative path for personality file in rebuild server test."
Merge "Fix SSH host to floating IP from fixed IP"