Trivial enhancement to API classes.

  * DataLinkHost.equals(Object): Return false if the class of the given
    object does not match exactly.
  * VTenantPath.compareTo(VTenantPath): Remove redundant code.
    The class name should not be the same if the class objects are not
    identical.
  * IVTNManagerAware: Added missing @since doclet.

Change-Id: I8704df9cbd873e61c2078182ac46cddc87ec4115
Signed-off-by: Shigeru Yasuda <s-yasuda@da.jp.nec.com>
Merge "Trivial enhancement to API classes."