Rather than enumerating RHEL versions, use comparison against
"known-good" version to make the expressions easier to read and
understand.
Also convert users of '~<' to '<', as '~<' compares only minor versions
within the same major.
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Relevancy changes are made based on recommendations from:
tmt test lint --fix
Some packages are available for Fedoras only and are not available
for RHELs at all.
Some packages are available for latest RHEL major versions only.
