Fix an attempt to read unset variable $rtent
Make return_gateways_array() return all disabled gateways when $disabled is true, it should fix #3291
fix typo
Define dynamic gateway for GRE interfaces and do not user to define IP address to the interface. Fixes #3280
Revert "Define dynamic gateway for GRE interfaces and do not user to define IP address to the interface. Fixes #3280"

Another solution will be implemented

This reverts commit bb6291e0204ffe2828fe9c9425bdae9c8541fe54.