update BUILD files

vendor/github.com/coreos/go-systemd/daemon/BUILD

@@ -6,6 +6,7 @@ go_library(
         "sdnotify.go",
         "watchdog.go",
     ],
+    importpath = "github.com/coreos/go-systemd/daemon",
     visibility = ["//visibility:public"],
 )
 

vendor/github.com/coreos/go-systemd/dbus/BUILD

@@ -10,6 +10,7 @@ go_library(
         "subscription.go",
         "subscription_set.go",
     ],
+    importpath = "github.com/coreos/go-systemd/dbus",
     visibility = ["//visibility:public"],
     deps = ["//vendor/github.com/godbus/dbus:go_default_library"],
 )

vendor/github.com/coreos/go-systemd/journal/BUILD

@@ -3,6 +3,7 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library")
 go_library(
     name = "go_default_library",
     srcs = ["journal.go"],
+    importpath = "github.com/coreos/go-systemd/journal",
     visibility = ["//visibility:public"],
 )
 

vendor/github.com/coreos/go-systemd/unit/BUILD

@@ -8,6 +8,7 @@ go_library(
         "option.go",
         "serialize.go",
     ],
+    importpath = "github.com/coreos/go-systemd/unit",
     visibility = ["//visibility:public"],
 )
 

vendor/github.com/coreos/go-systemd/util/BUILD

@@ -7,6 +7,7 @@ go_library(
         "util_cgo.go",
     ],
     cgo = True,
+    importpath = "github.com/coreos/go-systemd/util",
     visibility = ["//visibility:public"],
     deps = ["//vendor/github.com/coreos/pkg/dlopen:go_default_library"],
 )