Werk #11699: mk_postgres support for python2.6 linux platform

Component	Checks & agents
Title	mk_postgres support for python2.6 linux platform
Date	Dec 1, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The API call "platform.system()" provides better support for python2/3 compatibility than "sys.platform".

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