Add "SourceInfoFormat := Single;" to all test configs

This will make sure that all log files will contain information about
the .ttcn source file name and line number that has caused the log,
which is extremely useful during debugging.

Change-Id: Id6785757f20279ba84b34747f878baf67d065b20
diff --git a/ggsn_tests/GGSN_Tests.cfg b/ggsn_tests/GGSN_Tests.cfg
index a7f4681..e97578c 100644
--- a/ggsn_tests/GGSN_Tests.cfg
+++ b/ggsn_tests/GGSN_Tests.cfg
@@ -1,4 +1,5 @@
 [LOGGING]
+SourceInfoFormat := Single;
 ConsoleMask := DEBUG | LOG_ALL | MATCHING | DEBUG_TESTPORT
 
 LoggerPlugins := { JUnitLogger := "libjunitlogger2" }