[winswitch] RHEL/CentOS repo packages

[Michael Cronenworth]

Hi Antoine,

The 4.2.1/4.3 update has caused a conflict in the RHEL/CentOS repo.

You have both 4.2.1 and 4.3 package versions out there, but not a complete set.

'python3-xpra-*' has 4.3, but no matching 'xpra-*' package set so there is a package 
dependency failure.

This also causes problems if people want to pin on a branch. While you can pin a 
version in yum/dnf you can't pin on a branch without manually touching the version 
number with each branch release.

One solution is one package repo per branch. Another is to inject the branch name 
into the package name.

Thanks,
Michael