Revert "Version bump to etcd v3.2.11, grpc v1.7.5"

vendor/github.com/cockroachdb/cmux/BUILD

@@ -1,31 +0,0 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "buffer.go",
-        "cmux.go",
-        "matchers.go",
-        "patricia.go",
-    ],
-    importpath = "github.com/cockroachdb/cmux",
-    visibility = ["//visibility:public"],
-    deps = [
-        "//vendor/golang.org/x/net/http2:go_default_library",
-        "//vendor/golang.org/x/net/http2/hpack:go_default_library",
-    ],
-)
-
-filegroup(
-    name = "package-srcs",
-    srcs = glob(["**"]),
-    tags = ["automanaged"],
-    visibility = ["//visibility:private"],
-)
-
-filegroup(
-    name = "all-srcs",
-    srcs = [":package-srcs"],
-    tags = ["automanaged"],
-    visibility = ["//visibility:public"],
-)