migrate dependency management to Go1.11 module

go.mod

@@ -0,0 +1,27 @@
+module github.com/onestraw/golb
+
+require (
+	github.com/coreos/etcd v3.3.10+incompatible
+	github.com/davecgh/go-spew v1.1.1
+	github.com/gogo/protobuf v1.2.0
+	github.com/golang/protobuf v1.2.0
+	github.com/gorilla/context v1.1.1
+	github.com/gorilla/mux v1.6.2
+	github.com/hashicorp/consul v1.4.0
+	github.com/hashicorp/go-cleanhttp v0.5.0
+	github.com/hashicorp/go-rootcerts v0.0.0-20160503143440-6bb64b370b90
+	github.com/hashicorp/serf v0.8.1
+	github.com/konsorten/go-windows-terminal-sequences v1.0.1
+	github.com/mitchellh/go-homedir v1.0.0
+	github.com/mitchellh/mapstructure v1.1.2
+	github.com/pmezard/go-difflib v1.0.0
+	github.com/sirupsen/logrus v1.2.0
+	github.com/stretchr/testify v1.2.2
+	golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9
+	golang.org/x/net v0.0.0-20181220203305-927f97764cc3
+	golang.org/x/sys v0.0.0-20181228144115-9a3f9b0469bb
+	golang.org/x/text v0.3.0
+	google.golang.org/genproto v0.0.0-20181221175505-bd9b4fb69e2f
+	google.golang.org/grpc v1.17.0
+	gopkg.in/yaml.v2 v2.2.2
+)