use start-stop-daemon directly #921205

In init script use start-stop-daemon directly instead of lsb-base's
killproc which currently fails to pass on the executable name to s-s-d
(921558). This broke with s-s-d 1.19.2 which (for security reasons)
requires further filtering arguments in addition to --pidfile when the pid
file is not owned by root. Closes: #921205