Fix downgrade in migration

Fixes a downgrade bug caused by a portprofile_bindings table
definition mismatch between 2a6d0b51f4bb_cisco_plugin_cleanup
and the initial definition.

Change-Id: I051e5b41a4285b6cf24270ea6229b1bbca42106d
Closes-Bug: #1250454
Merge "Fix downgrade in migration"