test-controller: Rename to ovs-testcontroller, again install.

mininet uses the Open vSwitch controller by default, for testing.

CC: 757761@bugs.debian.org
Reported-at: https://bugs.debian.org/757761
Requested-by: Tomasz Buchert <tomasz.buchert@inria.fr>
Requested-by: Dariusz Dwornikowski <dariusz.dwornikowski@cs.put.poznan.pl>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Justin Pettit <jpettit@nicira.com>