Add the ability to update passwords for datasources without requiring a server reload

It's common to need to update datasource passwords every so often. When the password is updated, a server reload is required. 

It would be good to be able to update datasource passwords without requiring a server reload. We'd need to flush idle connections and ensure that all subsequent connection creation uses the new password and that connections that are in-use/reserved at the time of the change are terminated/evicted as they are returned to the pool.

This will likely need to be a cross component RFE. We can hold credentials in the credential store or in the management model so would likely need to explore all of these to come up with a complete solution.