Set up static analysis for on-boarding

Configured PMD Maven plugin in the onboarding pom.xml, with a custom ruleset.
Currently disabled by default, can be ran on demand.

Change-Id: I0e7ba1aeb1aefcea86fc2534ebc62343057f7c34
Issue-ID: SDC-246
Signed-off-by: vempo <vitaliy.emporopulo@amdocs.com>
diff --git a/pom.xml b/pom.xml
index e6e4d92..17bf79a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -340,6 +340,7 @@
 				<activeByDefault>true</activeByDefault>
 			</activation>
 			<modules>
+				<module>build-tools</module>
 				<module>onboarding</module>
 				<module>security-utils</module>
 				<module>common-app-api</module>