add a missing "import time"
add a missing "import time"

Line 174 in condor.py is `time.sleep()`, but `time` is never imported.
This causes condor batch jobs to fail.

schuhschuh/MIRTK,BioMedIA/MIRTK,schuhschuh/MIRTK,schuhschuh/MIRTK,schuhschuh/MIRTK,BioMedIA/MIRTK,BioMedIA/MIRTK,BioMedIA/MIRTK