Add options to auto-register channels on service startup

[ziegfried]

So I need to read the docs/code a bit more, but we could possibly add a pollPeerForJoinedChannels function here so that we don't need to explicitly wait for a GET request on the server. This could be a configuration flag that we set, like 'AUTO_REGISTER_CHANNELS` or something like that.

The peer channel list function does what we need:
https://hyperledger-fabric.readthedocs.io/en/release-1.4/commands/peerchannel.html

The code on the CLI side invokes the cscc chaincode on the peer node with the GetChannels argument:
https://github.com/hyperledger/fabric/blob/release-1.4/peer/channel/list.go#L53

You can see the cscc chaincode here:
https://github.com/hyperledger/fabric/blob/master/core/scc/cscc/configure.go#L211

Access to cscc requires that the Fabric Logger user have the correct ACL policy set.

The node SDK is really poorly documented but I think this is the right place to look for submitted transactions:
https://fabric-sdk-node.github.io/release-1.4/tutorial-handlers.html

Originally posted by @jeffywu in #10