Set grace period to 1m in dev script

[NicolasMahe]

Set grace period to 1m in dev script to give enough time to the engine to stop running services and stop gracefully.
The default in docker is only 10sec.

closes #1634

The engine's log should output all on this when stopping:

INFO[0022] stopping running services                     module=main
INFO[0022] ABCIQuery                                     data= module=rpc path=custom/runner/list result="value:\"null\" height:77 "
INFO[0022] cleanup container                             module=main
INFO[0022] stopping lcd server                           module=main
INFO[0022] RPC HTTP server stopped                       err="accept tcp [::]:1317: use of closed network connection"
WARN[0022] accept tcp [::]:1317: use of closed network connection  module=main
INFO[0022] stopping orchestrator                         module=main
INFO[0022] stopping grpc server                          module=main
INFO[0022] stopping tendermint                           module=main
INFO[0022] Stopping Node                                 impl=Node
INFO[0022] Stopping Node
INFO[0022] Stopping EventBus                             impl=EventBus module=events
INFO[0022] Stopping PubSub                               impl=PubSub module=pubsub
INFO[0022] Stopping IndexerService                       impl=IndexerService module=txindex
INFO[0022] Stopping P2P Switch                           impl="P2P Switch" module=p2p
INFO[0022] Stopping Reactor                              impl=Reactor module=mempool
INFO[0022] Stopping BlockchainReactor                    impl=BlockchainReactor module=blockchain
ERRO[0022] Not stopping BlockPool -- have not been started yet  impl=BlockPool module=blockchain
INFO[0022] Stopping Reactor                              impl=ConsensusReactor module=consensus
INFO[0022] Stopping State                                impl=ConsensusState module=consensus
INFO[0022] Stopping TimeoutTicker                        impl=TimeoutTicker module=consensus
INFO[0022] Stopping baseWAL                              impl=baseWAL module=consensus wal=/root/.mesg/tendermint/data/cs.wal/wal
INFO[0022] Stopping Group                                impl=Group module=consensus wal=/root/.mesg/tendermint/data/cs.wal/wal
INFO[0022] Stopping Reactor                              impl=Reactor module=evidence
INFO[0022] Stopping Reactor                              impl=Reactor module=pex
INFO[0022] Stopping AddrBook                             book=/root/.mesg/tendermint/config/addrbook.json impl=AddrBook module=p2p
INFO[0022] Closing rpc listener                          listener="&{0xc00009c060 0xc000083140 {0 {0 0}} 0xc0000831a0}"
INFO[0022] RPC HTTP server stopped                       err="accept tcp [::]:26657: use of closed network connection" module=rpc-server

if those logs don't show up, the engine has been killed and the databases might be corrupted (happen sometime when syncing with the network)