go: re-do the entire thing

This is a mega-change, but attempting to split this up further is
probably not worth the effort.

Summary:

1. Bump up bazel, rules_go, and others.
2. Switch to new go target naming (bye bye go_default_library)
3. Move go deps to go.mod/go.sum, use make gazelle generate from that
4. Bump up Python deps a bit

And also whatever was required to actually get things to work - loads of
small useless changes.

Tested to work on NixOS and Ubuntu 20.04:

   $ bazel build //...
   $ bazel test //...

Change-Id: I8364bdaa1406b9ae4d0385a6b607f3e7989f98a9
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1583
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/cluster/prodaccess/BUILD.bazel b/cluster/prodaccess/BUILD.bazel
index 4db48dd..9189010 100644
--- a/cluster/prodaccess/BUILD.bazel
+++ b/cluster/prodaccess/BUILD.bazel
@@ -1,7 +1,7 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
 
 go_library(
-    name = "go_default_library",
+    name = "prodaccess_lib",
     srcs = [
         "hspki.go",
         "kubernetes.go",
@@ -10,19 +10,19 @@
     importpath = "code.hackerspace.pl/hscloud/cluster/prodaccess",
     visibility = ["//visibility:private"],
     deps = [
-        "//cluster/certs:go_default_library",
-        "//cluster/prodvider/proto:go_default_library",
-        "//go/pki:go_default_library",
-        "//go/workspace:go_default_library",
-        "@com_github_golang_glog//:go_default_library",
+        "//cluster/certs",
+        "//cluster/prodvider/proto",
+        "//go/pki",
+        "//go/workspace",
+        "@com_github_golang_glog//:glog",
         "@org_golang_google_grpc//:go_default_library",
-        "@org_golang_google_grpc//credentials:go_default_library",
-        "@org_golang_x_crypto//ssh/terminal:go_default_library",
+        "@org_golang_google_grpc//credentials",
+        "@org_golang_x_crypto//ssh/terminal",
     ],
 )
 
 go_binary(
     name = "prodaccess",
-    embed = [":go_default_library"],
+    embed = [":prodaccess_lib"],
     visibility = ["//visibility:public"],
 )
diff --git a/cluster/prodaccess/prodaccess.go b/cluster/prodaccess/prodaccess.go
index 1153bab..2d734f9 100644
--- a/cluster/prodaccess/prodaccess.go
+++ b/cluster/prodaccess/prodaccess.go
@@ -14,7 +14,7 @@
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 
-	"code.hackerspace.pl/cluster/certs"
+	"code.hackerspace.pl/hscloud/cluster/certs"
 	pb "code.hackerspace.pl/hscloud/cluster/prodvider/proto"
 )