Updating all graylog2 packages to 0.20.1

Files Modified:
SPECS/graylog2-radio.spec
SPECS/graylog2-server.spec
SPECS/graylog2-web-interface.spec

Updating the version number in all spec files to the latest
production ready release of 0.20.1
Reverting the version of the radio package back to 0.20.0

Files Modified:
SPECS/graylog2-radio.spec

Since only the server and web-interface packages were updated
to the 0.20.1 release the radio package returned a 404 when
trying to download the spec file sources.