Add support for Ansible 2.9

[walterdolce]

I am running the Ansible 2.9.0.dev0 and v2.0.1 of the Ansible role and it seems they dropped support for sudo in favour of become as highlighted in the documentation.

This breaks the role as Ansible errors with:

ERROR! 'sudo' is not a valid attribute for a Task

The error appears to be in '/path/to/ansible/roles/wtanaka.gcloud-sdk/tasks/compat_sudo.yml': line 2, column 3, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

---
- name: install python-apt on ansible < 1.6.0 and ubuntu et al
  ^ here

This error can be suppressed as a warning using the "invalid_task_attribute_failed" configuration

Converting all sudo task attributes to become should fix the problem.

[michael-stevens]

I'm also getting what looks like this problem:

ERROR! conflicting action statements: raw, sudo

The error appears to be in '/home/michael.stevens/.ansible/roles/wtanaka.gcloud_sdk/tasks/compat_sudo.yml': line 2, column 3, but may                                                                                                               
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

---
- name: install python-apt on ansible < 1.6.0 and ubuntu et al
  ^ here

[roelvanduijnhoven]

This is still a problem in the current repo. And no new version was issued. Can I do something to help this forward?