@Override
    public void deleteVCard(String username) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("LdapVCardProvider: Attempted to delete vcard in read-only mode.");
    }
Handles when a user deletes their vcard.

@param username User that deketed their vcard.
@throws UnsupportedOperationException If an invalid field is changed or we are in readonly mode.
xmppserver/src/main/java/org/jivesoftware/openfire/ldap/LdapVCardProvider.java