Jonathan Rosser a10d00766e Remove references to unsupported operating systems
All references to Gentoo, SUSE, Debian stretch and Centos-7  are removed.
Conditional tasks, ternary operators and variables are simplified where possible
OS specific variables files are generalised where possible

Change-Id: If9dfa6aaa1e90856c6a4c074fd33b8e49b57a5fc
2021-03-21 20:48:54 +01:00
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