fix references to old variables and to other files

Signed-off-by: paulfantom <pawel@krupa.net.pl>

examples/minikube.jsonnet

@@ -1,11 +1,13 @@
 local kp =
-  (import 'kube-prometheus/kube-prometheus.libsonnet') +
-  (import 'kube-prometheus/kube-prometheus-kubeadm.libsonnet') +
+  (import 'kube-prometheus/main.libsonnet') +
+  (import 'kube-prometheus/platforms/kubeadm.libsonnet') +
   // Note that NodePort type services is likely not a good idea for your production use case, it is only used for demonstration purposes here.
-  (import 'kube-prometheus/kube-prometheus-node-ports.libsonnet') +
+  (import 'kube-prometheus/addons/node-ports.libsonnet') +
   {
-    _config+:: {
-      namespace: 'monitoring',
+    values+:: {
+      common+: {
+        namespace: 'monitoring',
+      },
       alertmanager+:: {
         config: importstr 'alertmanager-config.yaml',
       },
@@ -22,7 +24,7 @@ local kp =
     // For simplicity, each of the following values for 'externalUrl':
     //  * assume that `minikube ip` prints "192.168.99.100"
     //  * hard-code the NodePort for each app
-    prometheus+:: {
+    prometheus+: {
       prometheus+: {
         // Reference info: https://coreos.com/operators/prometheus/docs/latest/api.html#prometheusspec
         spec+: {