Moving all linux tests runners on nuc tester (bc-nuc) to avoid overhead on shuttle-linux. Added verbose output on variables for easier debugging. Changed mr tester job name to explicitely name concerned distrib.

changing the way to declare a scheduled job. Now the variable related to the scheduled job is needed in only. There is no excepts anymore. Renamed also the file related to linux prepare, and fixed the names reference in root files, and fixed typos

attempt to turn tets jobs in parallel for bctoolbox, bellesip, bzrtp, belr, and bzrtp to compare results and time spent