Update lifecycle package command to support more types

[jt-nti]

It is possible to create external builders and launchers for Fabric, however there is no easy way to package chaincode for those builders and launchers. For example, Fabric now includes a chaincode as a service builder, and other builders and launchers are available.

The current fabric lifecycle package command relies on positional parameters, so as part of this issue I would like to make improvements as follows...

Package a chaincode

Usage:
  fabric lifecycle package <chaincode-path> [flags]

Flags:
  -a, --archive string   name of the output tgz file
  -h, --help             help for package
  -i, --indexes string   path containing state database index definitions for CouchDB
  -l, --label string     human-readable description of the package
  -t, --type string      the chaincode type (e.g. GOLANG, JAVA, NODE)

The packaging code currently depends on fabric-sdk-go, however rather than update copies of packaging code from the Fabric peer command in that repo, I would like to either take a more up-to-date cut of the Fabric code, or investigate making use of the fabric-admin-sdk project instead... hyperledger/fabric-admin-sdk#15