packaging: setup: validate host id

Added host id validation on additional hosts setup.
Requires: http://gerrit.ovirt.org/19140

Rebased the code for being compatible with
http://gerrit.ovirt.org/19140

Bug-Url: https://bugzilla.redhat.com/1012417
Change-Id: I2487abfe1f722cb60e6f7c2a8daa4a81fb654bfd
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>