pmreorder: quick fix store drain flush drain

src/test/Makefile

src/test/pmreorder_flushes/.gitignore

src/test/pmreorder_flushes/Makefile

src/test/pmreorder_flushes/TEST0

src/test/pmreorder_flushes/pmreorder_flushes.c

src/test/pmreorder_flushes/pmreorder_flushes0.log.match

src/tools/pmreorder/statemachine.py