potential large dangling connections (500) up to the point the servers closes them when using the default simpler way to connect

[filipecosta90]

I believe we might have an issue on the go client that is not closing the idle connections when using the default simpler way to connect.
Given we have a connection timeout of 0 ( due to not passing a default ) and that we have a max idle of 500 coons ( very old default, I believe from the start of client ) we might have a lot of dangling connections up to the point the servers closes them. This we can we investigate and fix.