Werk #3234: Make unixcat more robust

Component	Core & setup
Title	Make unixcat more robust
Date	Feb 23, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Previously it could happen that unixcat crashed when system resources and/or limits were low, especially the nproc limit. Now we emit sensible error messages and exit with new return codes (5 and 6).

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