Always build python2 and python3 versions.
Always build python2 and python3 versions.

Also need to include the python2-devel package for the macros. Blivet's
Makefile now defaults to python3 so we need to explicitly set the python
version when installing.

vojtechtrefny/blivet,jkonecny12/blivet,vpodzime/blivet,rhinstaller/blivet,vojtechtrefny/blivet,vpodzime/blivet,jkonecny12/blivet,AdamWill/blivet,AdamWill/blivet,rvykydal/blivet,rhinstaller/blivet,rvykydal/blivet