fix resource error reporting for unavailable resource

On failure to find an unused resource (in case a test tries to use more
resources than are reserved), the handling code had a bug: print
reserved_resources from the proper source, i.e. suite_run.

Change-Id: Ifdc4201581b3293605196292339e841543ea284e

src/osmo_gsm_tester/suite.py

@@ -99,7 +99,7 @@ class Test(log.Origin):
                                          self.path)
                     success = True
             except resource.NoResourceExn:
-                self.err('Current resource state:\n', repr(reserved_resources))
+                self.err('Current resource state:\n', repr(suite_run.reserved_resources))
                 raise
             finally:
                 if success: