Updated config validator function to check for None values

[mousavian]

When using this SDK with ansible inventory script, it fails with expected string or bytes-like object error when one or few required fields are not provided in oci config, but initialised with None value in the inventory script.

Here's the stack trace when the user is missing:

$ ./inventory/oci/oci_inventory.py --list --debug
Executing in debug mode.
Traceback (most recent call last):
  File "./inventory/oci/oci_inventory.py", line 374, in __init__
    self.identity_client = self.create_service_client(IdentityClient)
  File "./inventory/oci/oci_inventory.py", line 464, in create_service_client
    client = service_client_class(params, **kwargs)
  File "./venv/lib/python3.7/site-packages/oci/identity/identity_client.py", line 60, in __init__
    validate_config(config, signer=kwargs.get('signer'))
  File "./venv/lib/python3.7/site-packages/oci/config.py", line 112, in validate_config
    if not pattern.match(config[key]):
TypeError: expected string or bytes-like object

expected string or bytes-like object

[bhagwatvyas]

Hi @mousavian, sorry for delayed response. We recently made some changes to the config logic, could you please rebase and update this PR?

[mousavian]

@bhagwatvyas done

[mross22]

if we're doing this to handle config[required_key] = None I think it makes sense to make the same fix for config[fallback_key] = None

[mousavian]

True. Thanks for pointing it out @mross22.
I've updated the branch with changes.

[nalsaber]

It looks fine from Ansible perspective

[mousavian]

I've applied requested changes. Let me know if anything else is needed.