replace "dep" with "go mod"

A simple "go mod init && go mod tidy && go mod vendor" was enough and
mostly seems to have picked the same revisions of the dependencies as
before. Notable exceptions are klog and gogo/protobuf.

vendor/k8s.io/kubernetes/pkg/util/goroutinemap/BUILD

@@ -0,0 +1,41 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+    "go_test",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["goroutinemap.go"],
+    importpath = "k8s.io/kubernetes/pkg/util/goroutinemap",
+    deps = [
+        "//pkg/util/goroutinemap/exponentialbackoff:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
+        "//vendor/k8s.io/klog:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["goroutinemap_test.go"],
+    embed = [":go_default_library"],
+    deps = ["//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [
+        ":package-srcs",
+        "//pkg/util/goroutinemap/exponentialbackoff:all-srcs",
+    ],
+    tags = ["automanaged"],
+)

vendor/k8s.io/kubernetes/pkg/util/goroutinemap/OWNERS

@@ -0,0 +1,6 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+approvers:
+- saad-ali
+reviewers:
+- saad-ali

vendor/k8s.io/kubernetes/pkg/util/goroutinemap/exponentialbackoff/BUILD

@@ -0,0 +1,25 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["exponential_backoff.go"],
+    importpath = "k8s.io/kubernetes/pkg/util/goroutinemap/exponentialbackoff",
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)

vendor/k8s.io/kubernetes/pkg/util/slice/BUILD

@@ -0,0 +1,33 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+    "go_test",
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = ["slice.go"],
+    importpath = "k8s.io/kubernetes/pkg/util/slice",
+    deps = ["//staging/src/k8s.io/apimachinery/pkg/util/rand:go_default_library"],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["slice_test.go"],
+    embed = [":go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)