Yast new installer changes

- added `yast2-ldap-client`, `yast2-pam` and `yast2-security` to the root
  image (needed to write the user configuration in the 1st stage)
- `yast2-runlevel` has been replaced by `yast2-services-manager`
Merge pull request #7 from lslezak/new_installer_changes

Yast new installer changes
adjust to yast2 package changes
integrate s390 fixes
dracut instead of mkinitrd
dracut or mkinitrd
remove cyrus-sasl
s390 adjustments
updated all_modules module list and included script to create it
make code ppc64le aware
re-enabled some yast packages
- special motd for s390x (bnc #795003)
add sysconfig to inst-sys
add 'upgrade' boot entry
icewm is using update-alternatives now
adapt to wicked and libqt5 changes
prepare for ruby updates
don't list libstroke
fix the previous ruby update fix
- better update-alternatives alternative
- added wicked
- removed tightvnc
Merge branch 'master' of github.com:openSUSE/installation-images

Conflicts:
	data/root/root.file_list
enabled SLES themes