Report exception message when binary invocation fails (#873)
Report exception message when binary invocation fails (#873)

+ python3 -m mtools.mlaunch.mlaunch --dir /tmpfs/db --binarypath /opt/mongodb/bin --setParameter enableTestCommands=1 --setParameter acceptApiVersion2=1 --setParameter diagnosticDataCollectionEnabled=false --replicaset --name test-rs --nodes 2 --arbiter
Fatal error trying get output from `/opt/mongodb/bin/mongod`.Is the binary in your path?

Co-authored-by: Oleg Pudeyev <e6fb06210fafc02fd7479ddbed2d042cc3a5155e@olegp.name>
rueckstiess/mtools,rueckstiess/mtools