opensuse-manuals_en: updates the docs and two bugfixes

This update fixes the following issues for opensuse-manuals_en:
- bnc#779139: Fixed openvpn related file references
- bnc#778567: Use updated suse-xsl-stylesheets to build the PDF; keycaps are now properly labeled
- Added parameter --xsltparam "'--param hyphenate.verbatim 0'" to build PDF (needed by FOP)
- Update text and image files:
* Updated GNOME and KDE chapters.
* Added Snapper and VNC chapters.

Fixed bugs
bnc#778567
Startup Guide shows some key presses as [] instead of [alt], [ctrl] etc.
bnc#779139
Path to cert and key files must be absolute in openvpn server config
Selected Binaries
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