Remove last ksonnet reference and direckt dependency

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

jsonnet/kube-prometheus/jsonnetfile.json

@@ -37,16 +37,6 @@
       },
       "version": "master"
     },
-    {
-      "source": {
-        "git": {
-          "remote": "https://github.com/ksonnet/ksonnet-lib",
-          "subdir": ""
-        }
-      },
-      "version": "master",
-      "name": "ksonnet"
-    },
     {
       "source": {
         "git": {

jsonnet/kube-prometheus/kube-prometheus-static-etcd.libsonnet

@@ -1,5 +1,3 @@
-local k = import 'github.com/ksonnet/ksonnet-lib/ksonnet.beta.4/k.libsonnet';
-
 (import 'github.com/etcd-io/etcd/Documentation/etcd-mixin/mixin.libsonnet') + {
   _config+:: {
     etcd: {
@@ -94,8 +92,7 @@ local k = import 'github.com/ksonnet/ksonnet-lib/ksonnet.beta.4/k.libsonnet';
         'etcd-client.crt': std.base64($._config.etcd.clientCert),
       },
     },
-    prometheus+:
-      {
+    prometheus+: {
       // Reference info: https://coreos.com/operators/prometheus/docs/latest/api.html#prometheusspec
       spec+: {
         secrets+: [$.prometheus.secretEtcdCerts.metadata.name],