added script to run valgrind (on unit tests code) easily
added script to run valgrind (on unit tests code) easily

hanw/behavioral-model,p4lang/behavioral-model,ops-p4/ops-p4dp,hanw/behavioral-model,ops-p4/ops-p4dp,hanw/behavioral-model,hanw/behavioral-model,hanw/behavioral-model,ops-p4/ops-p4dp,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,ops-p4/ops-p4dp,p4lang/behavioral-model