Sesi 70 opal python rpm

-Fixed the Python module plain .tar.gz (package 'opal.security' was not being bundled)
-Modified core.py so it works on Python 2.6 (no out-of-the-box 2.7 available for CentOS/RPM)
-Added 'rpm-build' profile to POM
-Added a repos.pp file to opal-vagrant, to be able to retrieve RPMs python-protobuf 2.5.0 and python-argparse