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 Pro, Checkmk Ultimate MT 2.0.0p2 Checkmk Pro, Checkmk Ultimate MT

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

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