Flush all pending LDAP modifications.

def flush_mod(self):
        """Flush all pending LDAP modifications."""
        for dn in self.__pending_mod_dn__:
            try:
                if self.__ro__:
                    for mod in self.__mod_queue__[dn]:
                        if mod[0] == ldap.MOD_DELETE:
                            mod_str = "DELETE"
                        elif mod[0] == ldap.MOD_ADD:
                            mod_str = "ADD"
                        else:
                            mod_str = "REPLACE"
                        print("{} VALUE {} = {} FOR {}".format(mod_str,
                                                               mod[1],
                                                               mod[2],
                                                               dn))
                else:
                    self.__con__.modify_s(dn, self.__mod_queue__[dn])
            except ldap.TYPE_OR_VALUE_EXISTS:
                print("Error! Conflicting Batch Modification: %s"
                      % str(self.__mod_queue__[dn]))
                continue
            except ldap.NO_SUCH_ATTRIBUTE:
                print("Error! Conflicting Batch Modification: %s"
                      % str(self.__mod_queue__[dn]))
                continue
            self.__mod_queue__[dn] = None
        self.__pending_mod_dn__ = []