- Move DAOs to mayoapp.dao package instead of the awkward
  org.mayocat.store.rdbms.dbi.dao
- Extract SQL queries outside the user and tenant DAO
- Fix user behavior DAO since its table name does not match the user
  entity type name
Missing moves from the org.mayocat.store.rdbms.dbi.dao -> mayoapp.dao
refactoring
Adds an API for creating new tenants. Tenant creation can be restricted
to users with a certain role in mayocat's configuration.