Revert version update of spotbugs for now, because the new spotbugs

finds additional issues that cause the build to fail. Revert this change
once those issues are fixed.

Change-Id: I6a31625102007f6d20c520dae69d46d21bf50a24
Signed-off-by: Leif Geiger <leif.geiger@yatta.de>

org.eclipse.epp.mpc-parent/pom.xml

@@ -325,7 +325,7 @@
             <plugin>
                <groupId>com.github.spotbugs</groupId>
                <artifactId>spotbugs-maven-plugin</artifactId>
-               <version>4.1.3</version>
+               <version>3.1.12.2</version>
                <configuration>
                   <findbugsXmlOutput>true</findbugsXmlOutput>
                   <failOnError>false</failOnError>