jbpm3 build javadoc error

I had a chance to look in more detail at the error that I was getting with the jBPM builds. It only happens when running -Prelease (-Psoa, -Pdistro) and it only happens if this is the very first build for a version.

To reproduce it, change -SNAPSHOT in the pom.xml files to something that does not exist, e.g. -FOO. Then run `mvn -Prelease -Dmaven.test.skip=true install`. You will see that the javadoc phase in "jBPM3 - Core" tries to use modules that aren't yet available (it fails trying to find org.jbpm.jbpm3:jbpm-jpdl:pom:3.2.10-FOO).

I noticed this because we want to change the SOA build in MEAD to just use the jBPM release, and then we can remove the SOA profile. MEAD has its own repository, and has no access to any other repository. So, whan I tried to build jBPM -Prelease in MEAD, it failed.