Support multiple local volume provisioner StorageClasses (#3450)

- Local Volume StorageClass configuration is now manged by `local_volume_provisioner_storage_classes`, a list of maps that specifies local storage classes with `name` `host_dir` and `mount_dir` keys per entry
- Tasks and templates updated to loop through local volume storage classes
- Previous defaults for path/class names were not changed
- Fixed an issue where a `kubernetes/preinstall` was creating directories inconsistently with the `kubernetes-apps/external_provisioner/local_volume_provisioner` task

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

@@ -2,13 +2,15 @@
 
 - name: Local Volume Provisioner | Ensure base dir is created on all hosts
   file:
-    path: "{{ local_volume_provisioner_base_dir }}"
+    path: "{{ item[1].host_dir }}"
     state: directory
     owner: root
     group: root
     mode: 0700
-  delegate_to: "{{ item }}"
-  with_items: "{{ groups['k8s-cluster'] }}"
+  delegate_to: "{{ item[0] }}"
+  with_nested:
+    - "{{ groups['k8s-cluster'] }}"
+    - "{{ local_volume_provisioner_storage_classes }}"
   failed_when: false
 
 - name: Local Volume Provisioner | Create addon dir