Werk #7440: Added Mattermost support in notification plugin

Component	Notifications
Title	Added Mattermost support in notification plugin
Date	May 7, 2019
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p17 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Mattermost is an Open Source alternative to Slack. It provides an equivalent Web Hook API to Slack and thus can be used in the same way as the current Slack notification plugin works.

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