Don't mass assign primary key (director uuid)
WIP migrate bosh to rds
[#49306843] Refactor existing RDS migration

Add new helper RdsDb class
Explicitly create only ccdb, uaadb, mysql-service-public,
mysql-service-cf-internal databases
Add new WIP migration for BOSH rds db
[#49306843] Pull RdsDb helper class into MigrationHelper
[#49306843] Refactor BOSH RDS migration to use helper class

First two examples for BOSH RDS migration passing
[#49306843] - aws migration with utf8 params
update the migrator to record migration after each migration rather than after the batch
minor rspec syntax change
use the mysql2 gem not mysql
timeout after 60mins for RDS
Fix migration for mysql2 gem support

* Added ld library path for mysql client to director control script

[finishes #49306843]
Fixup typos in spec