Tests: Asynchronous iSCSI write test

Dispatch a number of WRITE10 requests simultaneously, and await all
responses.

Signed-off-by: David Disseldorp <ddiss@suse.de>

test-tool/iscsi-test-cu.c

@@ -378,6 +378,7 @@ static CU_TestInfo tests_write10[] = {
         { (char *)"ZeroBlocks", test_write10_0blocks },
         { (char *)"WriteProtect", test_write10_wrprotect },
         { (char *)"DpoFua", test_write10_dpofua },
+        { (char *)"Async", test_async_write },
         CU_TEST_INFO_NULL
 };