treewide: switch to gomod and bump everything

This switches version resolution from fietsje to gomod and updates
all Go dependencies. It also bumps rules_go (required by gVisor) and
switches the Gazelle naming convention from go_default_xxx to the
standard Bazel convention of the default target having the package
name.

Since Kubernetes dropped upstream Bazel support and doesn't check in
all generated files I manually pregenerated the OpenAPI spec. This
should be fixed, but because of the already-huge scope of this CL
and the rebase complexity this is not in here.

Change-Id: Iec8ea613d06946882426c2f9fad5bda7e8aaf833
Reviewed-on: https://review.monogon.dev/c/monogon/+/639
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>
Reviewed-by: Leopold Schabel <leo@nexantic.com>
diff --git a/metropolis/node/kubernetes/pki/BUILD.bazel b/metropolis/node/kubernetes/pki/BUILD.bazel
index cfbba0c..f2e4e3c 100644
--- a/metropolis/node/kubernetes/pki/BUILD.bazel
+++ b/metropolis/node/kubernetes/pki/BUILD.bazel
@@ -1,16 +1,16 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_library")
 
 go_library(
-    name = "go_default_library",
+    name = "pki",
     srcs = ["kubernetes.go"],
     importpath = "source.monogon.dev/metropolis/node/kubernetes/pki",
     visibility = ["//metropolis/node:__subpackages__"],
     deps = [
-        "//metropolis/node:go_default_library",
-        "//metropolis/pkg/logtree:go_default_library",
-        "//metropolis/pkg/pki:go_default_library",
-        "@io_etcd_go_etcd//clientv3:go_default_library",
-        "@io_k8s_client_go//tools/clientcmd:go_default_library",
-        "@io_k8s_client_go//tools/clientcmd/api:go_default_library",
+        "//metropolis/node",
+        "//metropolis/pkg/logtree",
+        "//metropolis/pkg/pki",
+        "@io_etcd_go_etcd_client_v3//:client",
+        "@io_k8s_client_go//tools/clientcmd",
+        "@io_k8s_client_go//tools/clientcmd/api",
     ],
 )
diff --git a/metropolis/node/kubernetes/pki/kubernetes.go b/metropolis/node/kubernetes/pki/kubernetes.go
index 542c614..1a14f99 100644
--- a/metropolis/node/kubernetes/pki/kubernetes.go
+++ b/metropolis/node/kubernetes/pki/kubernetes.go
@@ -32,7 +32,7 @@
 	"fmt"
 	"net"
 
-	"go.etcd.io/etcd/clientv3"
+	clientv3 "go.etcd.io/etcd/client/v3"
 	"k8s.io/client-go/tools/clientcmd"
 	configapi "k8s.io/client-go/tools/clientcmd/api"