Jonathan Rosser e0afffd98c 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: I96a9757621eab69e7bc16a2e31ab28d0eb8a23be
2021-03-10 12:16:38 +00:00
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