Jonathan Rosser c1edfb23bc 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: Ia09789da8c8137c982dcd7560fe61a98a07309e7
2021-03-10 12:16:40 +00:00
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