nagios-plugins-zypper: Update to 1.50 and one additional fix

This update fixes the following issues with nagios-plugins-zypper:
- Update to 1.50
+ bnc#839839: also handle "out-of-date" for outdated repositories
+ SLE-11-SP1 is not supported any more
+ bnc#830658: also use the keyword "Softwarestack" as indication for an update of the software stack as such

Fixed bugs
bnc#830658
server:monitoring/nagios-plugins-zypper: Bug
bnc#839839
nagios-plugins-zypper: check_zypper does ignore the -o option
Selected Binaries
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