New framework for Sonar testing

Currently the links between $ATLAS$ sites are being tested by an older version of the Sonar tests which periodically send files between every pair of sites at a given time. This results in testing each link only once per week as well as testing links where the traffic is already significant which makes this sort of testing redundant to an extent. We propose a new implementation of Sonar testing where certain links are tested more frequently as a result of balancing the amount of testing with respect to the traffic on individual links. Our goal was to test the least frequently used links more often and to rarely send the Sonar dataset on the links with the higher traffic to remove the redundancy in testing.