test/multipath: add logical unit reset test

This test issues a logical unit reset iSCSI TMF request, and then
confirms that all paths report a subsequent unit attention condition.

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

test-tool/iscsi-test-cu.h

@@ -301,5 +301,6 @@ void test_writeverify16_dpo(void);
 void test_writeverify16_residuals(void);
 
 void test_multipathio_simple(void);
+void test_multipathio_reset(void);
 
 #endif	/* _ISCSI_TEST_CU_H_ */