Werk #14136: apc_symmetra_test: support alternate date format

Component	Checks & agents
Title	apc_symmetra_test: support alternate date format
Date	Jun 22, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Previously, the check apc_symmetra_test would result in an unknown state, if the data was based on the PowerChute Business Edition. The underlying reason was that we did not implement parsing for the underlying date format correctly.

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