TESTS: Add different log levels to the TUR test test suite and see how it looks

Add different log levels and update the TUR testsute.
Update the helper for testunitready() so that it
* prints FAILURE messages for normal and verbose levels
* prints selfdocumenting messages for which SCSI command it sends and the expected result for the verbose level

test-tool/iscsi-test.h

@@ -30,7 +30,6 @@
 
 extern int show_info;
 
-
 int T0000_testunitready_simple(const char *initiator, const char *url);
 
 int T0100_read10_simple(const char *initiator, const char *url);