Fix go get loading issues

[ggarri]

Adding latest alpha version of qkm to Orchestrate the following warning message showed up:

$> go get github.com/consensys/[email protected]
....
go: finding module for package github.com/Azure/go-autorest
# github.com/consensys/quorum-key-manager/src/nodes/api
/home/ggarrido/go/pkg/mod/github.com/consensys/[email protected]/src/nodes/api/api.go:26:11: subrouter.Use undefined (type *mux.Router has no field or method Use)
# github.com/consensys/quorum-key-manager/src/stores/api/handlers
/home/ggarrido/go/pkg/mod/github.com/consensys/[email protected]/src/stores/api/handlers/stores.go:34:16: storeSubrouter.Use undefined (type *mux.Router has no field or method Use)