Adding the ZFS test suite.  It was originally written by Sun as part
of the STF (Solaris test framework).  They open sourced it in
OpenSolaris, then HighCloud partially ported it to FreeBSD, and
Spectra Logic finished the port.  We also added 37 testcases, fixed
many broken ones, and converted them all to the ATF framework.

Submitted by:	araujo, asomers, gibbs, ken, smh, will
Sponsored by:	Spectra Logic, HighCloud