Added findbugs and pmd plugins to ONOS site build.

This is a fix for ONOS-1017

Change-Id: I984aed6dfcf708f7e68fc19411b8836ea2d96aba
diff --git a/pom.xml b/pom.xml
index ef5aee1..6803d4c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -258,6 +258,24 @@
 	</reportSets>
       </plugin>
       <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>findbugs-maven-plugin</artifactId>
+        <version>2.5.3</version>
+        <configuration>
+          <reportPlugins>
+            <plugin>
+              <groupId>org.codehaus.mojo</groupId>
+              <artifactId>findbugs-maven-plugin</artifactId>
+            </plugin>
+          </reportPlugins>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-pmd-plugin</artifactId>
+        <version>3.0.1</version>
+      </plugin>
+      <plugin>
 	<groupId>org.apache.maven.plugins</groupId>
 	<artifactId>maven-jxr-plugin</artifactId>
 	<version>2.3</version>