Fix a problem related to unit tests and lack of pthread linking
Fix a problem related to unit tests and lack of pthread linking

cern-it-sdc-id/davix,cern-it-sdc-id/davix,cern-it-sdc-id/davix,EricKTCheung/davix,EricKTCheung/davix,EricKTCheung/davix,EricKTCheung/davix,cern-it-sdc-id/davix