Werk #6550: Fixed warning "bad ps syntax" when stopping a site on e.g. SLES11

Component	Site management
Title	Fixed warning "bad ps syntax" when stopping a site on e.g. SLES11
Date	Sep 5, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When using older ps versions like procps 3.2.7, which is used e.g. on SLES11, a warning message like this was displayed when executing "omd stop" on a site:

Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html Stopping 1 remaining site processes...OK

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