A Debian package is expected to remove all its configuration files (which
includes all files in /etc) when it is purged, but the
openvswitch-controller package wasn't doing that. This fixes the problem.
Debian bug #682187.
CC: 682187@bugs.debian.org
Reported-by: Andreas Beckmann <debian@abeckmann.de>
Signed-off-by: Ben Pfaff <blp@nicira.com>