Mistake in usage alter_column's parameter type_

[Ann Taraday]

In alembic alter_column have a parameter type_ not _type.

File "/opt/stack/neutron/neutron/db/migration/alembic_migrations/versions/338d7508968c_vpnaas_peer_address_.py", line 47, in upgrade
    _type=sa.String(255), existing_type=sa.String(64))
  File "<string>", line 7, in alter_column
  File "<string>", line 1, in <lambda>
  File "/opt/stack/neutron/.tox/py27/local/lib/python2.7/site-packages/alembic/util.py", line 271, in go
    raise TypeError("Unknown arguments: %s" % ", ".join(names))
TypeError: Unknown arguments: _type

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/51140
Committed: http://github.com/openstack/neutron/commit/a272a2838313b56edc1463f6d81a01414b37a78f
Submitter: Jenkins
Branch: master

commit a272a2838313b56edc1463f6d81a01414b37a78f
Author: Ann Kamyshnikova <email address hidden>
Date: Fri Oct 11 12:05:59 2013 +0400

    Fix migration

    In migration 338d7508968c_vpnaas_peer_address_ was mistake in
    usage alter_column's parameter type_.

    Closes-Bug: #1238561

    Change-Id: I6e0eb8260cf5e8d8f557b174c7985e2f7ca1c912

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: milestone-proposed
Review: https://review.openstack.org/51302

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/51302
Committed: http://github.com/openstack/neutron/commit/2833fc3d171205ce70d7ad8875838bdb9c0d57a4
Submitter: Jenkins
Branch: milestone-proposed

commit 2833fc3d171205ce70d7ad8875838bdb9c0d57a4
Author: Ann Kamyshnikova <email address hidden>
Date: Fri Oct 11 12:05:59 2013 +0400

    Fix migration

    In migration 338d7508968c_vpnaas_peer_address_ was mistake in
    usage alter_column's parameter type_.

    Closes-Bug: #1238561

    Change-Id: I6e0eb8260cf5e8d8f557b174c7985e2f7ca1c912
    (cherry picked from commit a272a2838313b56edc1463f6d81a01414b37a78f)