*: rejigger tls certs and more

This pretty large change does the following:

 - moves nix from bootstrap.hswaw.net to nix/
 - changes clustercfg to use cfssl and moves it to cluster/clustercfg
 - changes clustercfg to source information about target location of
   certs from nix
 - changes clustercfg to push nix config
 - changes tls certs to have more than one CA
 - recalculates all TLS certs
   (it keeps the old serviceaccoutns key, otherwise we end up with
   invalid serviceaccounts - the cert doesn't match, but who cares,
   it's not used anyway)
diff --git a/cluster/certs/ca-kube.crt b/cluster/certs/ca-kube.crt
new file mode 100644
index 0000000..c44255e
--- /dev/null
+++ b/cluster/certs/ca-kube.crt
@@ -0,0 +1,23 @@
+-----BEGIN CERTIFICATE-----
+MIID2DCCAsCgAwIBAgIUfa+oMG9sYHFeuhBgb8wSWHJ7ozUwDQYJKoZIhvcNAQEL
+BQAwgYMxCzAJBgNVBAYTAlBMMRQwEgYDVQQIEwtNYXpvd2llY2tpZTEPMA0GA1UE
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+0x2OLa8SDh01+hjchaxsjfDCmB11X/HZrGu7QvqQQa7KBFyGriWqXMNMaHXk9gfJ
+Wmz7aVEP0xhksVIml4ShuQqf1C1y1ut7FXfJUPppnvrfjSvR7p6zQgJ+5VAh+k9p
+NBnIrkplq0gGUSgeTu+BMMRS2/AxmSnfvsqvx52mnypWn7fUG+b6IASOesVv1hry
+TgHlXjl3Dv5hQ6//pWi+rgD8wT7OLkLf/ekVvQ==
+-----END CERTIFICATE-----