*: 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/secrets/cipher/kubefront-apiserver.key b/cluster/secrets/cipher/kubefront-apiserver.key
new file mode 100644
index 0000000..dd7f8bc
--- /dev/null
+++ b/cluster/secrets/cipher/kubefront-apiserver.key
@@ -0,0 +1,80 @@
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