Werk #15562: Drop unsupported distros

Component	Site management
Title	Drop unsupported distros
Date	May 12, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

This change may affect you in case you've been using Checkmk with the following distros:

• Ubuntu 16.04
• Ubuntu 18.04
• SLES 12 SP3
• SLES 12 SP4
• SLES 15

Checkmk will now not be built anymore for those distros.

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