Make name parameter optional for the BaseObjectHelper.get_object function

[mrchrd]

This fix the case where get_object is called for a method that accepts no argument (like list_group).

[fabianvf]

Can you give me an example that is failing without this change?

[mrchrd]

When using the Ansible Kubernetes module (https://github.com/ansible/ansible-kubernetes-modules), asking to list groups for example, fail.

# task.yml
---
- openshift_v1_group_list:
  register: o_groups
- debug:
    var: o_groups

This returns an error:

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TypeError: list_group() takes exactly 1 argument (3 given)

Traceback (most recent call last):
  File "/tmp/ansible_gDZmjF/ansible_module_openshift_v1_group_list.py", line 332, in <module>
    main()
  File "/tmp/ansible_gDZmjF/ansible_module_openshift_v1_group_list.py", line 326, in main
    module.execute_module()
  File "/tmp/ansible_gDZmjF/ansible_modlib.zip/ansible/module_utils/k8s_common.py", line 178, in execute_module
  File "/usr/lib/python2.7/site-packages/openshift/helper/base.py", line 164, in get_object
    k8s_obj = get_method(name, namespace)
TypeError: list_group() takes exactly 1 argument (3 given)

Since no condition catches the case where both name and namespace are None, it reaches the else case and calls get_method(name, namespace) while list_group() expects no argument.