More dynamic local-storage-provisioner approach (#3472)

* Makes local volume provisioner more dynamic

* Correct variable name in local storage provisioner defaults

* Updates external-provisioner readme

* Updates variable naming to be more clear, more documentation, fixes sample inventory

* Variable refactor, untangled some jinja2 loops

* Corrects variable name

* No variable substitution in dict keys, replaced with anchor

* Fixes default storage_classes dict, inline docs

* Fixes spelling in inline docs

* Addresses comments in review

* Updates all the defaults

* Fix failing CI task

* Fixes external provisioner daemonset

roles/kubernetes-apps/external_provisioner/local_volume_provisioner/tasks/main.yml

@@ -1,8 +1,7 @@
 ---
-
 - name: Local Volume Provisioner | Ensure base dir is created on all hosts
   file:
-    path: "{{ item[1].host_dir }}"
+    path: "{{ local_volume_provisioner_storage_classes[item.1].host_dir }}"
     state: directory
     owner: root
     group: root
@@ -10,7 +9,7 @@
   delegate_to: "{{ item[0] }}"
   with_nested:
     - "{{ groups['k8s-cluster'] }}"
-    - "{{ local_volume_provisioner_storage_classes }}"
+    - "{{ local_volume_provisioner_storage_classes.keys() }}"
   failed_when: false
 
 - name: Local Volume Provisioner | Create addon dir