2933 compiler warning gags need better granularity
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

6399128 want tool to examine backup files (zstreamdump)

--HG--
rename : usr/src/uts/common/fs/zfs/fletcher.c => usr/src/common/zfs/zfs_fletcher.c