tests: only unlink tmp file if it exists
NagVis: Updated to current nightly build; removed deprecated var/nagvis/userfiles directory
check_icmp: allow levels for packet loss > 100%
check_icmp: finish patch, fix exit code
NagVis test can now be run without nagios/thruk/check_mk packages
Merge branch 'master' of mathias-kettner.de:omd
rename to omd-nc
added icinga2
added naemon

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>