Bug 514165: [Interoperability][Rpy] Clean log and messages in oep.interoperability.rpy - merge the 2 messages classes and files from the plugin - remove the log File Not found" for files coming from Rpy installation - minors others changes Change-Id: I3749b8bbb09d76b0ed0c38c39c911b8aacf5d872 Signed-off-by: Vincent Lorenzo <vincent.lorenzo@cea.fr>