TESTS: Start fixing up the tests so we can test-suite them properly

Dont call READCAPACITY from every single test.
Remove two arguments from the test signatures and turn them into globals.
remove the ret++ silliness.  Tests return 0 : all ok, -2, skipped or -1 : test failed

test-tool/0360_startstopunit_simple.c

@@ -21,7 +21,7 @@
 #include "scsi-lowlevel.h"
 #include "iscsi-test.h"
 
-int T0360_startstopunit_simple(const char *initiator, const char *url, int data_loss, int show_info)
+int T0360_startstopunit_simple(const char *initiator, const char *url)
 { 
 	struct iscsi_context *iscsi;
 	struct scsi_task *task;