box: add password history check stub

- Add box.cfg.password_history_length configuration option.
  It will specify the max number of entries to keep in the
  auth_history field of the _user system space.
- Add new error code ER_OLD_PASSWORD, which will be raised on
  an attempt to reuse an old password.
- Set auth_history if box.internal.prepare_auth_history is defined.
  The function takes a user id.
- Add auth_history argument to box.internal.check_password so that
  it can check if the new password matches an old one.
- Add box_lua_security_init, because auth checks will be done in C.

Needed for https://github.com/tarantool/tarantool-ee/issues/298

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