Unbreak utils_test_007_pos test, broken by the new fstyp(8) utility

tests/sys/cddl/zfs/bin/fstyp.ksh
Delete this Solaris compat shim

tests/sys/cddl/zfs/include/commands.txt
Fix the path to fstyp(8)

tests/sys/cddl/zfs/tests/utils_test/utils_test_007_pos.ksh
Remove solarisism and verify the output of fstyp(8)

Sponsored by: Spectra Logic Corp