Load a credential file as is setup like the Java utilities

def load_credential_file(self, path):
        """Load a credential file as is setup like the Java utilities"""
        c_data = StringIO.StringIO()
        c_data.write("[Credentials]\n")
        for line in open(path, "r").readlines():
            c_data.write(line.replace("AWSAccessKeyId", "aws_access_key_id").replace("AWSSecretKey", "aws_secret_access_key"))
        c_data.seek(0)
        self.readfp(c_data)