Use include/import tasks (#2192)

import_tasks will consume far less memory, so it should be
used whenever it is compatible.

roles/network_plugin/flannel/tasks/main.yml

@@ -1,5 +1,5 @@
 ---
-- include: pre-upgrade.yml
+- import_tasks: pre-upgrade.yml
 
 - name: Flannel | Create Flannel manifests
   template:
@@ -11,4 +11,4 @@
   register: flannel_node_manifests
   when:
     - inventory_hostname in groups['kube-master']
-    - rbac_enabled or item.type not in rbac_resources
+    - rbac_enabled or item.type not in rbac_resources

roles/network_plugin/weave/tasks/main.yml

@@ -1,5 +1,5 @@
 ---
-- include: seed.yml
+- import_tasks: seed.yml
   when: weave_mode_seed
 
 - name: Weave | Copy cni plugins from hyperkube