linchpin mock tests fail on aws_s3 module

[samvarankashyap]

Describe the bug
Linchpin mock tests fail on aws_s3 module

To Reproduce
Steps to reproduce the behavior:

linchpin init aws
# change linchpin_mock = True in linchpin.conf
linchpin -vvvv up 

Expected behavior
Mock provisioning should pass

Additional context
Error log:

            "permission": [
                "private"
            ],
            "prefix": "",
            "profile": null,
            "region": "ca-central-1",
            "retries": 0,
            "rgw": false,
            "s3_url": null,
            "security_token": null,
            "src": null,
            "validate_certs": true,
            "version": null
        }
    },
    "msg": "Failed while looking up bucket (during bucket_check) linchpins3bucket.: Unable to locate credentials"
}