Werk #10415: Fix linux agent for MRPE on non-root use

Component	Checks & agents
Title	Fix linux agent for MRPE on non-root use
Date	Dec 4, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

There was a escaping problem while constructing the command to be executed by mrpe when specifing a non-root user.

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