Jonathan Rosser dfe91c5ac0 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: Ibe914d0d547b930b8167bfa475cc838df8d7ae25
2021-03-16 08:51:12 +00:00
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