Checkpoint commit for OPENDJ-175: Decouple OpenDJ LDAP SDK from Grizzly

* Fix issue with dependencies when using opendj-ldap-sdk
   Now we ensure that :
   - maven-based clients don't get dependencies on opendj-core and opendj-grizzly  
   - non-maven-based clients can use jar with all dependencies included
 
 opendj-ldap-sdk module uses:
 - maven-shade-plugin to build a jar from opendj-core and opendj-grizzly, to hide opendj-core and opendj-grizzly and to provide a corresponding (reduced) pom
 - copy-maven-plugin to extract content of jar into target/classes directory (needed by bundle)
 - maven-bundle-plugin to generate a custom META-INF/MANIFEST file
 
* Remove duplicated javadoc/overview.html file