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/identd/ident/BUILD.bazel b/cluster/identd/ident/BUILD.bazel
index 737b814..a1bf063 100644
--- a/cluster/identd/ident/BUILD.bazel
+++ b/cluster/identd/ident/BUILD.bazel
@@ -1,7 +1,7 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
-    name = "go_default_library",
+    name = "ident",
     srcs = [
         "client.go",
         "errors.go",
@@ -11,17 +11,17 @@
     ],
     importpath = "code.hackerspace.pl/hscloud/cluster/identd/ident",
     visibility = ["//visibility:public"],
-    deps = ["@com_github_golang_glog//:go_default_library"],
+    deps = ["@com_github_golang_glog//:glog"],
 )
 
 go_test(
-    name = "go_default_test",
+    name = "ident_test",
     srcs = [
         "e2e_test.go",
         "request_test.go",
         "response_test.go",
         "server_test.go",
     ],
-    embed = [":go_default_library"],
-    deps = ["@com_github_go_test_deep//:go_default_library"],
+    embed = [":ident"],
+    deps = ["@com_github_go_test_deep//:deep"],
 )