Reinstating disabled WebSocket test

Fixes #2729
simple mention of port in JDBC pool configuration
Merge pull request #3348 from peterbecich/master

SettingsJDBC suggestion; non-standard port for MySQL and Postgres URLs
Merge pull request #2729 from jroper/2729-reinstating-disabled-test

Re-enable WebSocketSpec test
Handle null ups and downs in evolutions gracefully