Reduced size of integration tests image (#9817)
Reduced size of integration tests image (#9817)

### Motivation

The chown & chmod operations added in #9627 are causing docker to actually duplicate all the files in the overlay filesystem, increasing the image size by ~2GB. 

After this change the test image size is ~2.5 GB.
yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar