Werk #12612: Opsgenie: Fix notification plugin

Component	Notifications
Title	Opsgenie: Fix notification plugin
Date	Mar 24, 2021
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) 2.0.0p2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The notification script raised a ModuleNotFoundError "No module named ‘opsgenie'".

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