Use buildozer to remove deprecated automanaged tags

vendor/github.com/coreos/etcd/mvcc/BUILD

@@ -23,7 +23,6 @@ go_library(
         "watcher.go",
         "watcher_group.go",
     ],
-    tags = ["automanaged"],
     deps = [
         "//vendor/github.com/coreos/etcd/lease:go_default_library",
         "//vendor/github.com/coreos/etcd/mvcc/backend:go_default_library",

vendor/github.com/coreos/etcd/mvcc/backend/BUILD

@@ -21,7 +21,6 @@ go_library(
         ],
         "//conditions:default": [],
     }),
-    tags = ["automanaged"],
     deps = [
         "//vendor/github.com/boltdb/bolt:go_default_library",
         "//vendor/github.com/coreos/pkg/capnslog:go_default_library",

vendor/github.com/coreos/etcd/mvcc/mvccpb/BUILD

@@ -10,7 +10,6 @@ load(
 go_library(
     name = "go_default_library",
     srcs = ["kv.pb.go"],
-    tags = ["automanaged"],
     deps = ["//vendor/github.com/golang/protobuf/proto:go_default_library"],
 )