Jonathan Rosser 5e702329d5 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: I31c5e6cde00cdb7addcc0cb4b1c7a13529ce1e60
2021-03-10 12:18:02 +00:00
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