Jonathan Rosser 712641e32c 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: Ic1b8b532adec2c46373d3a0a3cea8387bff7817a
2021-03-17 09:46:35 +00:00
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