Limit the amount of AP listed to fit in popover

The amount of access points maight become unmanageable if you have more than one network interface. I curerntly have two Wifi cards, and besides the other bugs, like no individual switch for them, i can't access the other options on the indicator, since both interfaces list a lot of APs. My screen is 1377x768, so i can't get see the whole popover. Screenshot attached

Launchpad Details: [#LP1627426](https://bugs.launchpad.net/bugs/1627426) Mario Daniel Ruiz Saavedra - 2016-09-25 04:01:35 +0000