Rewrite fHits() in arc_summary.py with SI units

[zfs] / cmd / Makefile.am

SUBDIRS  = zfs zpool zdb zhack zinject zstreamdump ztest zpios
SUBDIRS += mount_zfs fsck_zfs zvol_id vdev_id arcstat dbufstat zed
SUBDIRS += arc_summary raidz_test zgenhostid