update BUILD files

vendor/github.com/coreos/pkg/capnslog/BUILD

@@ -17,6 +17,7 @@ go_library(
         ],
         "//conditions:default": [],
     }),
+    importpath = "github.com/coreos/pkg/capnslog",
     visibility = ["//visibility:public"],
     deps = ["//vendor/github.com/coreos/go-systemd/journal:go_default_library"],
 )

vendor/github.com/coreos/pkg/dlopen/BUILD

@@ -12,6 +12,7 @@ go_library(
     }),
     cgo = True,
     clinkopts = ["-ldl"],
+    importpath = "github.com/coreos/pkg/dlopen",
     visibility = ["//visibility:public"],
 )
 

vendor/github.com/coreos/pkg/health/BUILD

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

vendor/github.com/coreos/pkg/httputil/BUILD

@@ -6,6 +6,7 @@ go_library(
         "cookie.go",
         "json.go",
     ],
+    importpath = "github.com/coreos/pkg/httputil",
     visibility = ["//visibility:public"],
 )
 

vendor/github.com/coreos/pkg/timeutil/BUILD

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