Werk #12614: mknotifyd: Fix missing environment variables

Component	Notifications
Title	mknotifyd: Fix missing environment variables
Date	Mar 25, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p2 Checkmk Enterprise (CEE), Checkmk MSP (CME)

Not all environment variables where available on mknotifyd startup, resulting in missing variables in the notification context.

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