Stop immediately without active connections
Stop immediately without active connections

When a Close message is received, the MongoDBSystem switches into the
`closing` state and gently closes down all remaining connections.

All monitors are notified once all connections are closed. This depends
on at least a single ChannelClosed message to be received by the
`closing` receive method. Alas, this message will never arrive when
there're no active connections.

This will ultimately result in a timeout exception after a 10 seconds
timeout has elapsed.

maxime-gautre/ReactiveMongo,ornicar/ReactiveMongo,maxime-gautre/ReactiveMongo,ReactiveMongo/ReactiveMongo,cchantep/ReactiveMongo,ReactiveMongo/ReactiveMongo,charleskubicek/ReactiveMongo,cchantep/ReactiveMongo,charleskubicek/ReactiveMongo,ornicar/ReactiveMongo