Generate log seems to be broken

[ghost]

We need to rethink the feature. At any rate it currently seems broken
Hamdi ran into the following issue:
storlet_docker_gateway
def _upload_storlet_logs(self, slog_path):
if (config_true_value(self.idata['generate_log'])):
logfile = open(slog_path, 'r')

I ran into issues (namely an exception will be thrown) where this path was a directory namely:
/home/docker_device/logs/scopes/b2c9f064ec324/com.ibm.storlet.test.test1/

As opposed to the file:
/home/docker_device/logs/scopes/b2c9f064ec324/com.ibm.storlet.test.test1/storlet_invoke.log