The following _MAX_LEN constants are being removed from
neutron/api/v2/attributes.py in [1]. The corresponding DB field size
constants from neutron_lib.db.constants should be used instead.

All subproject maintainers should update their code to use the
the db *_FIELD_SIZE constants from neutron-lib.

I have submitted patches [2] for most subprojects.

 NAME_MAX_LEN              -->  NAME_FIELD_SIZE
 TENANT_ID_MAX_LEN         -->  PROJECT_ID_FIELD_SIZE
 DESCRIPTION_MAX_LEN       -->  DESCRIPTION_FIELD_SIZE
 LONG_DESCRIPTION_MAX_LEN  -->  LONG_DESCRIPTION_FIELD_SIZE
 DEVICE_ID_MAX_LEN         -->  DEVICE_ID_FIELD_SIZE
 DEVICE_OWNER_MAX_LEN      -->  DEVICE_NAME_FIELD_SIZE

In alembic migration scripts, the raw numerical value shall be used.

For more information, see [3].

[1] https://review.openstack.org/399891
[2] https://review.openstack.org/#/q/status:open+topic:use-db-field-sizes
[3] http://lists.openstack.org/pipermail/openstack-dev/2016-October/105789.html

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