test: Explain that a bug should be filed when the test fail

test/config.ini.in

@@ -7,6 +7,7 @@
 
 [environment]
 PACKAGE_NAME=@PACKAGE_NAME@
+PACKAGE_BUGREPORT=@PACKAGE_BUGREPORT@
 SRCDIR=@abs_top_srcdir@
 BUILDDIR=@abs_top_builddir@
 EXEEXT=@EXEEXT@

test/functional/test_framework/test_framework.py

@@ -290,7 +290,12 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
             exit_code = TEST_EXIT_SKIPPED
         else:
             self.log.error("Test failed. Test logging available at %s/test_framework.log", self.options.tmpdir)
+            self.log.error("")
             self.log.error("Hint: Call {} '{}' to consolidate all logs".format(os.path.normpath(os.path.dirname(os.path.realpath(__file__)) + "/../combine_logs.py"), self.options.tmpdir))
+            self.log.error("")
+            self.log.error("If this failure happened unexpectedly or intermittently, please file a bug and provide a link or upload of the combined log.")
+            self.log.error(self.config['environment']['PACKAGE_BUGREPORT'])
+            self.log.error("")
             exit_code = TEST_EXIT_FAILED
         # Logging.shutdown will not remove stream- and filehandlers, so we must
         # do it explicitly. Handlers are removed so the next test run can apply