Temporary workaround for Java 8 Javadoc errors

While looking at another issue, I came across this. When I cloned latest oozie and tried to build distro using `./bin/mkdistro.sh` I found that the build failed with following error.
-------
....
.../oozie/core/src/main/java/org/apache/oozie/service/UUIDService.java:114: error: reference not found
[ERROR] * systemId is the value defined in the

configuration property.
...
-------

The error seems to be due to the Java 8 feature (DocLint) that checks for errors in Java Docs strictly. The solution would be create a Java 8 specific profile to pass '-Xdoclint:none' to deactivate it. Having this flag for older java version fails to it has to be only for Java 8 using specific profile.

I will create a patch for the same.