Update heal_script for alembic 0.7.1

Alembic 0.7.1 contains checks of foreign keys so
method check_foreign_keys is not needed anymore.
Heal script should be updated to make it possible to use alembic
methods.

Closes-bug: #1398417

Change-Id: I7d0ba7f00567ae5a4dd0669ed86d6e8d554ca4ec
Merge "Update heal_script for alembic 0.7.1"