Go modules (#231)

Signed-off-by: Vince Prignano <vincepri@vmware.com>

BUILD.bazel

@@ -34,7 +34,7 @@ package(default_visibility = ["//visibility:public"])
 # gazelle:exclude vendor/golang.org/x/tools/go/pointer/testdata
 # gazelle:exclude vendor/golang.org/x/tools/go/ssa/interp/testdata
 # gazelle:exclude vendor/k8s.io/gengo/testdata
-# gazelle:exclude vendor/github.com/golang/dep/cmd/dep/testdata
+# gazelle:resolve go github.com/grpc-ecosystem/grpc-gateway/internal //vendor/github.com/grpc-ecosystem/grpc-gateway/internal:go_default_library
 gazelle(
     name = "gazelle",
     command = "fix",
@@ -49,11 +49,6 @@ filegroup(
     ],
 )
 
-workspace_binary(
-    name = "dep",
-    cmd = "@com_github_golang_dep//cmd/dep",
-)
-
 workspace_binary(
     name = "generate",
     args = [