local_volume_provisioner: match upstream storage class syntax

Use the upstream keys without converting them to snake case. This avoids
converting back to camel case when rendering, and aligns ourselves more
with our upstream.

roles/kubespray_defaults/vars/main/main.yml

@@ -69,10 +69,10 @@ kube_pods_subnets: >-
 local_volume_provisioner_storage_classes_default:
   - key: "{{ local_volume_provisioner_storage_class }}"
     value:
-      host_dir: "{{ local_volume_provisioner_base_dir }}"
-      mount_dir: "{{ local_volume_provisioner_mount_dir }}"
-      volume_mode: Filesystem
-      fs_type: ext4
+      hostDir: "{{ local_volume_provisioner_base_dir }}"
+      mountDir: "{{ local_volume_provisioner_mount_dir }}"
+      volumeMode: Filesystem
+      fsType: ext4
 
 ssl_ca_dirs_per_os_family:
   Debian: &usr_share