kubeadm: allow to provide patch inline in inventories

Specifying one directory for kubeadm patches is not ideal:
1. It does not allow working with multiples inventories easily
2. No ansible templating of the patch
3. Ansible path searching can sometimes be confusing

Instead, provide the patch directly in a variable, and add some quality
of life to handle components targeting and patch ordering more
explicitly (`target` and `type` which are translated to the kubeadm
scheme which is based on the file name)

roles/kubernetes/control-plane/tasks/kubeadm-upgrade.yml

@@ -18,7 +18,7 @@
     --ignore-preflight-errors=all
     --allow-experimental-upgrades
     --etcd-upgrade={{ (etcd_deployment_type == "kubeadm") | bool | lower }}
-    {% if kubeadm_patches is defined and kubeadm_patches.enabled %}--patches={{ kubeadm_patches.dest_dir }}{% endif %}
+    {% if kubeadm_patches | length > 0 %}--patches={{ kubeadm_patches_dir }}{% endif %}
     --force
   register: kubeadm_upgrade
   # Retry is because upload config sometimes fails
@@ -39,7 +39,7 @@
     --ignore-preflight-errors=all
     --allow-experimental-upgrades
     --etcd-upgrade={{ (etcd_deployment_type == "kubeadm") | bool | lower }}
-    {% if kubeadm_patches is defined and kubeadm_patches.enabled %}--patches={{ kubeadm_patches.dest_dir }}{% endif %}
+    {% if kubeadm_patches | length > 0 %}--patches={{ kubeadm_patches_dir }}{% endif %}
     --force
   register: kubeadm_upgrade
   # Retry is because upload config sometimes fails

roles/kubernetes/control-plane/templates/kubeadm-config.v1beta3.yaml.j2

@@ -28,9 +28,9 @@ nodeRegistration:
   kubeletExtraArgs:
     cloud-provider: external
 {% endif %}
-{% if kubeadm_patches is defined and kubeadm_patches.enabled %}
+{% if kubeadm_patches | length > 0 %}
 patches:
-  directory: {{ kubeadm_patches.dest_dir }}
+  directory: {{ kubeadm_patches_dir }}
 {% endif %}
 ---
 apiVersion: kubeadm.k8s.io/v1beta3

roles/kubernetes/control-plane/templates/kubeadm-controlplane.v1beta3.yaml.j2

@@ -31,7 +31,7 @@ nodeRegistration:
 {% else %}
   taints: []
 {% endif %}
-{% if kubeadm_patches is defined and kubeadm_patches.enabled %}
+{% if kubeadm_patches | length > 0 %}
 patches:
-  directory: {{ kubeadm_patches.dest_dir }}
+  directory: {{ kubeadm_patches_dir }}
 {% endif %}