use WFM::ClientExists() call instead of checking *.ycp file

presence (works also with non-YCP clients and checks also e.g.
/y2update/clients path)
Merge pull request #46 from yast/use_clientexists

use WFM::ClientExists() call instead of checking *.ycp file
Let udev handle only changed devices in kernel_finish. bnc#774301

Added --action=change option to udevadm trigger. Without that
all devices are handled as NEW and it has some side effects.
At least one of them is that device emulated on top of lcs on
s390 is lost. In such case installation cannot continue to
second stage when installing over network.
Updated changelog

Conflicts:
	VERSION
	package/yast2-installation.changes
Merge pull request #49 from mchf/bnc774301

I'm going to merge it as there are no objections and already in Code-11-SP3 branch.
- make check for sshd more robust (bnc#825160)
Merge pull request #50 from aschnell/master

- make check for sshd more robust (bnc#825160)
- only show desktops for which their defined patterns are known
  (needed when desktop defined in control file is only available
  via some optional installation source - fate#315061)
- 2.24.7
Merge pull request #51 from jsuchome/master

only show desktops for which their defined patterns are known
- adapt control.xml to offical Factory one:
  added e17 desktop, enabled online repositories
- 2.24.8
Merge pull request #53 from jsuchome/master

adapt control.xml to offical Factory one:
- show release notes of newest product first (bnc#827590)
- 2.24.9
Merge pull request #54 from jsuchome/master

show release notes of newest product first (bnc#827590)
- fixed sshd check (bnc#825160)
Merge pull request #55 from aschnell/master

- fixed sshd check (bnc#825160)
Making rpmcopy_secondstage steps unique also for SLES-for-VMware

- bnc#813072
Backported changes done for openSUSE in Build Service

- These changes are already in openSUSE:Factory
- Made by openSUSE release manager
Merge branch 'master' of github.com:kobliha/yast-installation