use include_tasks instead of include

include is marked as deprecated since ansible 2.4[0]

Switch to include_tasks or import_playbook as necessary

[0] https://docs.ansible.com/ansible/2.4/include_module.html#deprecated

Change-Id: I247990c66e2f415cfe19225c6fad7de646c312d1

tasks/install.yaml

@@ -32,4 +32,4 @@
     - nodepool_pip_virtualenv_python is not defined
     - nodepool_pip_executable is not defined
 
-- include: "install/{{ nodepool_install_method }}.yaml"
+- include_tasks: "install/{{ nodepool_install_method }}.yaml"

tasks/install/git.yaml

@@ -24,4 +24,4 @@
   set_fact:
     nodepool_pip_name: "file://{{ nodepool_git_dest }}"
 
-- include: pip.yaml
+- include_tasks: pip.yaml

tasks/main.yaml

@@ -15,7 +15,7 @@
 - name: Include OS-specific variables
   include_vars: "{{ ansible_os_family | lower }}.yaml"
 
-- include: "{{ nodepool_task }}.yaml"
+- include_tasks: "{{ nodepool_task }}.yaml"
   with_items: "{{ nodepool_task_manager }}"
   loop_control:
     loop_var: nodepool_task