TESTS: change ORWRITE to use a single helper function for all

Switch orwrite helpers to use _command_async instead of calling _orwrite_sync()
to prepare for switching to non-iscsi targets. Use the new check_result API
so that we only need a single helper function for ORWRITE instead of one
helper for each expected result.

Signed-off-by: Ronnie Sahlberg <sahlberg@localhost>

test-tool/test_nomedia_sbc.c

@@ -208,8 +208,9 @@ test_nomedia_sbc(void)
 	}
 
 	logging(LOG_VERBOSE, "Test ORWRITE when medium is ejected.");
-	ret = orwrite_nomedium(iscsic, tgt_lun, 0, block_size, block_size,
-			       0, 0, 0, 0, 0, buf);
+	ret = orwrite(iscsic, tgt_lun, 0, block_size, block_size,
+		      0, 0, 0, 0, 0, buf,
+		      EXPECT_NO_MEDIUM);
 	if (ret == -2) {
 		logging(LOG_NORMAL, "[SKIPPED] target does not support "
 			"ORWRITE");