AutoRefactored comments/javadocs on OpenDJ SDK

git-svn-id: https://svn.forgerock.org/opendj/trunk/opendj@11142 41b1ffd8-f28e-4786-ab96-9950f0a78031
ModelUtils.java:
Code deduplication and cleanup.

git-svn-id: https://svn.forgerock.org/opendj/trunk/opendj@11144 41b1ffd8-f28e-4786-ab96-9950f0a78031