Description/Steps to reproduce

1. Specify "lazyConnect": true in datasources.json for the given datasource.
2. Programmatically connect to this datasource after boot using:
   app.datasources.MyDatasource.connector.connect(function(){ console.log("Connected to MyDatasource."); });
3. After connecting seems to succeed, inspect the datasource's connector.dataSource.connected field and you will see that it is false.
4. Any attempts to execute native SQL against mysql will wait indefinitely.

Workaround

We were able to get this to work after rolling back loopback-datasource-juggler to 3.20.2.