prevent orchestrator from shutting down after one-shot runExecution() completed
prevent orchestrator from shutting down after one-shot runExecution() completed

Currently, only the direct mode has been tested

Signed-off-by: Akihiro Suda <ea940da7e429af3d0d0c18296cabd0112a36bad5@lab.ntt.co.jp>

osrg/namazu,fuku-ys/earthquake,osrg/namazu,fuku-ys/earthquake,osrg/earthquake,osrg/earthquake,fuku-ys/earthquake,AkihiroSuda/earthquake,fuku-ys/earthquake,osrg/earthquake,osrg/earthquake,AkihiroSuda/earthquake,osrg/earthquake,fuku-ys/earthquake,osrg/earthquake,osrg/namazu,AkihiroSuda/earthquake,AkihiroSuda/earthquake,fuku-ys/earthquake,osrg/namazu,osrg/namazu,fuku-ys/earthquake,osrg/earthquake,osrg/namazu,AkihiroSuda/earthquake,AkihiroSuda/earthquake,AkihiroSuda/earthquake,osrg/namazu,AkihiroSuda/earthquake,fuku-ys/earthquake