pxebr bridge is needed by Fuel, but causes issues with Foreman. It is
now removed in clean.sh. setup.sh is also updated to be executable and
fixes a bug where grep was being used on output that is in stderr.
JIRA: OCTO-109
Change-Id: I037e168e40f3352a61a604ed6cea21d10250b434 Signed-off-by: Tim Rozet <trozet@redhat.com>