Enable access logs in gateway

[f-necas]

Also need to have the fix in latest gateway :
georchestra/georchestra-gateway#146

[edevosc2c]

Can't we do it on the application level? Or in the gateway config file?

This way anyone can turn it on or off. Here it's forced by default for everyone.

[f-necas]

It can't be in gw config file but can be at application level.

For me, it should be implemented in every deployments of gw but if we don't wan't those logs we can change the level to warn to hide it.

[edevosc2c]

Reason of closing: Was discussed in a meeting.
We shouldn't force the user to have duplicated access logs with their existing reverse proxy. Unless it's worth doing it, like if there are info that you can't find in the reverse proxy access logs (authenticated user is an example).