Except scylla-python3, each scylla package has its own git repository, same package script filename, same build directory structure.
To put python3 thing on scylla repo, we created 'python3' directory on multiple locations, made '-python3' suffixed files, dig deeper build directory not to conflict scylla-server package build.
We should move all scylla-python3 related files to new repository, scylla-python3.
To keep compatibility with current Jenkins script, provide packages on
build/ directory for now.
Fixes#6751
352a136ae2