Update version number to 4.0.0

Ludovic Poitou

01.30.2016 7db6013c2d9b4d50fb9a9d225772300e773143ca

 opendj-server-legacy/src/main/java/org/opends/server/tools/upgrade/Upgrade.java

@@ -575,7 +575,7 @@
        clearReplicationDbDirectory());

    /** See OPENDJ-2435 */
    register("3.0.0",
    register("4.0.0",
        addConfigEntry(INFO_UPGRADE_TASK_BCRYPT_SCHEME_SUMMARY.get(),
            "dn: cn=Bcrypt,cn=Password Storage Schemes,cn=config",
            "changetype: add",