connman: Fix restart script

connman: Fix restart script

The script does not work if the connman service is already stopped.
The start-stop-daemon checks for the existence of a specified process.
If such a process exists, start-stop-daemon sends it the signal specified
by --signal, and exits with error status 0.  If such  a  process  does
not exist, start-stop-daemon exits with error status 1 (0 if --oknodo is specified).
The script uses set -e so we need to add --oknodo option to stop

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>