packaging: fix docker-centos5 - use pythonexe and set to "python" as before
Fix
92a51a45d44c .
packaging: move dockerrpm output directory creation to dockerrpm
Avoid having to compute the directory in two places in different environments.
packaging: drop "support" for unsupported Fedora versions
Fedora 31 has just been released, and Fedora 29 will be EOL in a month. Don't
spend any time thinking about dead stuff.