Global Host Reservations Task 5: data migration scripts to convert existing subnet-id values of 0
The changes made in 5704 to support global HRs necessitate migrating existing data. Specifically for MySQL and PostgreSQL, any columns with values of 0 for subnet IDs in hosts and options tables, need to replace with NULL, and for Cassandra, they should be replaced with GLOBAL_ID_UNUSED.
Data migration steps need to be added to the schema upgrade scripts for 1.5.0 to accommodate this.
Replaces http://kea.isc.org/ticket/5708
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