Adding experimental (and optional) support of log4cxx logging.

Also, adding a sample logging configuration
diff --git a/log4cxx.properties b/log4cxx.properties
new file mode 100644
index 0000000..ccf24a6
--- /dev/null
+++ b/log4cxx.properties
@@ -0,0 +1,17 @@
+# Set root logger level to DEBUG and its only appender to A1.
+log4j.rootLogger=ERROR, A1
+
+# A1 is set to be a ConsoleAppender.
+log4j.appender.A1=org.apache.log4j.ConsoleAppender
+
+# A1 uses PatternLayout.
+log4j.appender.A1.layout=org.apache.log4j.PatternLayout
+log4j.appender.A1.target=System.err
+#log4j.appender.A1.layout.ConversionPattern=%d{dd-MMM HH:MM:SS,SSS} %p %c %m%n
+log4j.appender.A1.layout.ConversionPattern=%d{h:m:s,SSS} %t %-10c{1}  %m%n
+
+log4j.logger.SyncLogic = TRACE
+#log4j.logger.bgpparser=TRACE
+#log4j.logger.bgpparser.AttributeType=ERROR
+#log4j.logger.bgpparser.MRTCommonHeader=ERROR
+