Added test case in test_migrations for migration 208

This patch is to add test case in test_migrations.py for migration 208.
Migration 208 was brought by commit 74b024f75403c168b5c69ee67a16d1053965e5db
(Change-Id: I72371260159c9fdffcdb57209095fc103b6dd79e)

Change-Id: I153abf260716c8af61d7ccf554d91ba80f559e60
Signed-off-by: Shane Wang <shane.wang@intel.com>
Merge "Added test case in test_migrations for migration 208"