(2.3.x): Adding logging module using LogCacheClient (#1065)

* Adding logging module using LogCacheClient

* Documenting logging starter

src/pmd/pmdTestRuleSet.xml

@@ -73,6 +73,7 @@
 	</rule>
 	<rule ref="category/java/multithreading.xml">
 		<exclude name="UseConcurrentHashMap" />
+		<exclude name="DoNotUseThreads"/>
 	</rule>
 	<rule ref="category/java/performance.xml" />
 	<rule ref="category/java/security.xml" />