Cancelling WPA2 authentication disables the wired network interface

Image attached is the authentication dialog displayed when I try and connect to a WPA2 enterprise network. If I click cancel (in the hopes that I will just click on the settings button in the plug to further configure), the whole interface gets deactivated, which makes the interface settings button disappear.

Expected: when clicking cancel, the interface should not be disabled.

Launchpad Details: [#LP1603993](https://bugs.launchpad.net/bugs/1603993) Zisu Andrei - 2016-07-18 13:24:11 +0000

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