Close fd on DEVICE_OFF. (LP #276887)

Leaving the fd open means we still get keyboard events after VT switching
away. Coming back, some of these events are replayed on the application that
has the current focus.

Reproduceable:
1. open terminal, focus.
2. VT switch away
3. type something, preferably a password
4. VT switch back, trigger a mouse event
5. Observe the X server guessing your password.

Closing the fd on DEVICE_OFF fixes this. Reopen is handled by the reopen
code introduced with

    commit 9930477cbeb4acfd070ae70894d13ffabfc347b8
    Author: Peter Hutterer <peter.hutterer@redhat.com>
    Date:   Tue Aug 26 14:33:40 2008 +0930

        Attempt to re-open devices on read errors.

Launchpad Bug 276887
<https://bugs.edge.launchpad.net/ubuntu/+source/xorg-server/+bug/276887>

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