Jonathan Rosser f2093a18ed 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: I8224deceba331d9fbca64c151b27430530a18528
2021-03-16 10:47:53 +00:00
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