ZTS: Add missing tests to Makefile.am

The send-c_zstream_recompress.ksh test case was being skipped
because it was not added to the Makefile.am, and was thus left
out of the package.

As for the renameat2 tests these were being skipped because
when the patch was rebased it was not updated to use the new
Makefile layout for the tests directory. Correct this.

Add missing pre/post sections to sanity.run so the pyzfs tests
will run.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Damian Szuberski <szuberskidamian@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #14266