Fix zpool create -o <property> error message

When `zpool create -o <property>` is run without root permissions
and the pool property requested is not specifically enumerated in
zpool_valid_proplist().  Then an incorrect error message referring
to an invalid property is printed rather than the expected permission
denied error.

Specifying a pool property at create time should be handled the same
way as filesystem properties in zfs_valid_proplist().  There should
not be default zfs_error_aux() set for properties which are not
listed.

Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Reviewed-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9550 
Closes #9568

lib/libzfs/libzfs_pool.c

@@ -724,8 +724,6 @@ zpool_valid_proplist(libzfs_handle_t *hdl, const char *poolname,
 			break;
 
 		default:
-			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
-			    "property '%s'(%d) not defined"), propname, prop);
 			break;
 		}
 	}