godep: add dhcp4 and dhcp4client dependencies

vendor/github.com/d2g/dhcp4client/BUILD

@@ -0,0 +1,38 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "client.go",
+        "generatexid.go",
+        "inetsock.go",
+    ] + select({
+        "@io_bazel_rules_go//go/platform:linux_amd64": [
+            "pktsock_linux.go",
+        ],
+        "//conditions:default": [],
+    }),
+    visibility = ["//visibility:public"],
+    deps = [
+        "//vendor/github.com/d2g/dhcp4:go_default_library",
+    ] + select({
+        "@io_bazel_rules_go//go/platform:linux_amd64": [
+            "//vendor/golang.org/x/sys/unix:go_default_library",
+        ],
+        "//conditions:default": [],
+    }),
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)