Do not truncate test output
This makes sure test output is not truncated even if it does not contain the CTEST_FULL_OUTPUT
string...
@clemenci something similar might be useful for Gaudi to replace https://gitlab.cern.ch/gaudi/Gaudi/blob/master/GaudiPolicy/python/GaudiTesting/Run.py#L38-39
Edited by Rosen Matev