Merge pull request #3578 from pbalcer/common-dir-nparts-0

src/common/set.c

src/test/util_poolset/TEST4

src/test/util_poolset/TEST4w.PS1

src/test/util_poolset/TEST5

src/test/util_poolset/TEST5w.PS1

src/test/util_poolset/TEST6

src/test/util_poolset/TEST6w.PS1

src/test/util_poolset/TEST7

src/test/util_poolset/TEST8

src/test/util_poolset/out8.log.match