zfs test suite calculates md5 digests suboptimally
While going through the RTI for #12034 Dan noted that we could simplify some testing code by using digest(1) instead using md5sum(1) and piping the output to awk.
We can use digest(1) to replace the
md5sum | awk pattern pretty easily:
$ digest -a md5 README.md 7ed980493c1161d119bd89dc85819b3f