Default to ON for compression

A simple change, but so many tests break with it,
and those are the majority of this.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #13078

contrib/pyzfs/libzfs_core/test/test_libzfs_core.py

@@ -4132,7 +4132,8 @@ class _TempPool(object):
             cachefile = 'none'
         self._zpool_create = [
             'zpool', 'create', '-o', 'cachefile=' + cachefile,
-            '-O', 'mountpoint=legacy', self._pool_name, self._pool_file_path]
+            '-O', 'mountpoint=legacy', '-O', 'compression=off',
+            self._pool_name, self._pool_file_path]
         try:
             os.ftruncate(fd, size)
             os.close(fd)