Revamp the Makefiles for openzfs and openzfs-kmod:
- Bump port versions
- Update to a more recent commit
- Regen distinfo
- Add TESTS option to make ZTS installation optional
- Add descriptions for options
- Add missing run-time dependency on py-sysctl with PYTHON option
- Regen pkg-plist for openzfs
- Generate metadata headers post-patch
- Fix some inconsistent whitespace
- Remove unnecessary PLIST_SUB manipulation (automated by OPTIONS_SUB=yes)
- Unbreak openzfs-kmod