Propagate the original connection error, including reason and stack.

[mk-pmb]

because knowing why a connection failed, helps fixing it.

[gabrielstuff]

This is perfect ! It just helped me out with a strugling configuration error. Thanks @mk-pmb
Basically it just show where the error comes from. So instead of getting :

Error connecting to database:

with no more information, you get a nice :

Error connecting to database: failed to connect to [foobar:27017]

With the reason and the url of the db.

[kcbanner]

Thanks!

[mk-pmb]

To make it more future-proof, someone should update the instanceof to instead use my package is-error.

Edit: Nah, actually we should upgrade this to use verror. It's made with the express purpose of forwarding an error with an added explanation.