remove import from test_util.py
remove import from test_util.py

ShaperTools/openhtf,google/openhtf,jettisonjoe/openhtf,amyxchen/openhtf,grybmadsci/openhtf,ShaperTools/openhtf,google/openhtf,jettisonjoe/openhtf,google/openhtf,google/openhtf,fahhem/openhtf,fahhem/openhtf,ShaperTools/openhtf,jettisonjoe/openhtf,grybmadsci/openhtf,amyxchen/openhtf,fahhem/openhtf,ShaperTools/openhtf,jettisonjoe/openhtf,grybmadsci/openhtf,ShaperTools/openhtf,grybmadsci/openhtf,fahhem/openhtf