SQL as the backing datastore for Spinnaker microservices

[nimakaviani]

Spinnaker microservices can be configured to use SQL instead of Redis as the backing datastore. This issue serves as a place to track changes to be made to the SQL proto config as well as the respective Spinnaker microservices for SQL support.

SQL configuration is introduced to Kleat in #143 to enable it for Keel but it requires adding extra properties for it to work with other microservices.