[tests] Make comp test framework more debuggable

Add logging so that each test prints the line number of the yield
statement that generated the test.

test/functional/test_framework/comptool.py

@@ -295,8 +295,11 @@ class TestManager(object):
         # Wait until verack is received
         self.wait_for_verack()
 
-        test_number = 1
+        test_number = 0
-        for test_instance in self.test_generator.get_tests():
+        tests = self.test_generator.get_tests()
+        for test_instance in tests:
+            test_number += 1
+            logger.info("Running test %d: %s line %s" % (test_number, tests.gi_code.co_filename, tests.gi_frame.f_lineno))
             # We use these variables to keep track of the last block
             # and last transaction in the tests, which are used
             # if we're not syncing on every block or every tx.
@@ -397,9 +400,6 @@ class TestManager(object):
                 if (not self.check_mempool(tx.sha256, tx_outcome)):
                     raise AssertionError("Mempool test failed at test %d" % test_number)
 
-            logger.info("Test %d: PASS" % test_number)
-            test_number += 1
-
         [ c.disconnect_node() for c in self.connections ]
         self.wait_for_disconnections()
         self.block_store.close()