Comment 2 for bug 1474723

Reviewed: https://review.fuel-infra.org/9869
Submitter: mos-infra-ci <>
Branch: openstack-ci/fuel-7.0/2015.1.0

Commit: 29cad5f8a7f2cfb860e1609966f03d6be0a07dce
Author: Sergey Belous <email address hidden>
Date: Mon Jul 27 12:17:37 2015

Add error message when migrate from distributed router to centralized

When trying to migrate from distributed router to centralized
a NotImplementedError occurs with empty message.
Need to concretize a message.

Closes-Bug: #1477509
Closes-Bug: #1474723
Change-Id: I2b57ec5af38a0f87c1ab256cb8af66bc443be824