Description of problem:
The method file_migration_list in the SchemaMigration model is referencing the schema files in the old location. The files have all moved to ManageIQ/manageiq-schema.

This causes initial_migration to return nil and missing_file_migrations to raise an error resulting in the follow warn message in the logs:

[----] W, [2017-12-14T16:01:24.073145 #6812:3ff30c83f7cc] WARN -- : MIQ(MiqServer.check_migrations_up_to_date) comparison of Integer with nil failed

Version-Release number of selected component (if applicable):
5.9

Steps to Reproduce:
Server startup caused this

Actual results:
Method failed to check that migrations were up to date

Expected results:
Checking that migrations are up to date works