switch cloud images permanently to grub2

The main reason for cloud to use extlinux is the size of deps being
pulled in by grub2-tools. This will be fixed in F-26 with the ability
to use grub2/grub2-efi without the tools package and it's deps fixing
this issue for good. There will no doubt need to be be some tweaking
required here.

We need grub2 in cloud images for non x86 as well as for the increasing
x86 cloud platforms that require the support of uEFI which extlinux
doesn't support.

Signed-off-by: Peter Robinson <pbrobinson@fedoraproject.org>

fedora-cloud-base.ks

@@ -36,20 +36,14 @@ user --name=none
 
 firewall --disabled
 
-bootloader --timeout=1 --append="no_timer_check console=tty1 console=ttyS0,115200n8" --extlinux
+bootloader --timeout=1 --append="no_timer_check console=tty1 console=ttyS0,115200n8"
 
 network --bootproto=dhcp --device=link --activate --onboot=on
 services --enabled=sshd,cloud-init,cloud-init-local,cloud-config,cloud-final
 
 zerombr
 clearpart --all
-#
-# We need to disable 64bit options here or extlinux won't work.
-# See: http://www.syslinux.org/wiki/index.php/Filesystem#ext4
-# and
-# https://bugzilla.redhat.com/show_bug.cgi?id=1369934
-#
-part / --fstype ext4 --grow --mkfsoptions="-O ^64bit"
+part / --fstype ext4 --grow
 
 %include fedora-repo.ks
 
@@ -88,7 +82,7 @@ which
 #-kbd
 -uboot-tools
 -kernel
--grub2
+grub2
 
 %end
 
@@ -242,14 +236,6 @@ echo "-----------------------------------------------------------------------"
 # Note that running rpm recreates the rpm db files which aren't needed/wanted
 rm -f /var/lib/rpm/__db*
 
-
-# This is a temporary workaround for
-# <https://bugzilla.redhat.com/show_bug.cgi?id=1147998>
-# where sfdisk seems to be messing up the mbr.
-# Long-term fix is to address this in anaconda directly and remove this.
-# <https://bugzilla.redhat.com/show_bug.cgi?id=1015931>
-dd if=/usr/share/syslinux/mbr.bin of=/dev/vda
-
 # FIXME: is this still needed?
 echo "Fixing SELinux contexts."
 touch /var/log/cron