Add "Release & Renew" to the Interface Information tab

[wolph]

Describe your feature request:

It's a bit weird that you can view the IP address at the Information tab but need to go to Configure tab to renew the IP. And after you've done that, you need to go back to Information to see the current values.

I would personally even opt for merging these tabs entirely.

[BornToBeRoot]

I moved also the "Clear DNS cache"-Button to the other view.