disk_analyzer: switch Makefile test rule to use valgrind (stricter)
disk_analyzer: switch Makefile test rule to use valgrind (stricter)

cmusatyalab/gammaray,wenluhu/gammaray-android,cmusatyalab/gammaray,wenluhu/gammaray-android,wenluhu/gammaray-android,cmusatyalab/gammaray