Moved the call of exec "app_ctl.sh reload" into a forked child process
because the call to reload was killing haproxy_ctld and not able to
restart it.
Have haproxy_ctld wait for app_ctl to either kill it or reap the zombie.
Merge pull request #1627 from rmillner/BZ920711

Moved the call of exec "app_ctl.sh reload" into a forked child process