update to use fabric version 1.4.2

[cazfletch]

update to use fabric 1.4.2 now it is released. This includes the generator and the fabric we create in the cucumber tests. There are also some deprecated things we need to update

• update generator to use 1.4.2
• update fabric used in cucumber tests to 1.4.2
• automatic vendoring of the shim in go is deprecated so need to do it ourselves
• in the generator update update to using raft ordering service - can't do this as raft currently requires tls
• in the cucumber tests update to using raft ordering service

[cazfletch]

notes for go shim issue:

1. in the generator add a go.mod file with the correct dependency in it see https://blog.golang.org/using-go-modules
2. when we package go run go mod vendor