Tests: Asynchronous iSCSI read test

Dispatch a number of READ10 requests simultaneously, and await all
responses.

The iscsi-support test helper functions are currently all synchronous,
so this test mostly uses the bare libiscsi API. As new async tests are
added, we can make a more informed decision on which boilerplate code
can be split out.

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

test-tool/iscsi-test-cu.c

@@ -227,6 +227,7 @@ static CU_TestInfo tests_read10[] = {
         { (char *)"ZeroBlocks", test_read10_0blocks },
         { (char *)"ReadProtect", test_read10_rdprotect },
         { (char *)"DpoFua", test_read10_dpofua },
+        { (char *)"Async", test_async_read },
         CU_TEST_INFO_NULL
 };