Fix downgrade in migration

In 63afba73813_ovs_tunnelendpoints_id_unique migration mistake in
usage drop_constraint parameter type_ and positional agruments name
and table_name.

Closes-Bug: #1243073

Change-Id: I60cd6e7f18b193b71f8f20759251b9f59a79965a
Merge "Fix downgrade in migration"