Werk #12385: check_mk_agent.{aix,solaris}: Move read_python_version in order to init PATH and MK_* correctly

Component	Checks & agents
Title	check_mk_agent.{aix,solaris}: Move read_python_version in order to init PATH and MK_* correctly
Date	May 18, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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