installer: Fix relabeling of /var/log

Previously incorrect labels were set on all files in /var/log, this has
been fixed.

Change-Id: I521220c21add1d8a76a1e1486a53337514c44a47
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1128065
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
Block all gettys on installation

Previously we only blocked tty0 from appearing, now we block getty
instances on all consoles to prevent irritation.

This also prevents that the TUI installer is hidden by any getty.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1150918
Change-Id: I20508789d0bb3440f9175b7e60b5a7d4366edd7c
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
boot: Reset tty before showing the TUI

Change-Id: Ic3981b8a89df835326196a31e5868743f1857a2f
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
install: Partition probing ain't reliable

It seems that the partition probing during the installation wasn't
reliable, an extra call was added to flush all partition informations.

Change-Id: If889041a917112a06534595ba486ad473c6b7f4a
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1150377
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>