setup.py: "release" pushes master to the remote
setup.py: "release" pushes master to the remote

Automate one more step in the tag+release process

mmuzila/errata-tool,red-hat-storage/errata-tool,red-hat-storage/errata-tool,mmuzila/errata-tool,ktdreyer/errata-tool,ktdreyer/errata-tool