[docs] Verify build-image.sh Ops Mgr image build success & upload to local registry

[vap0rtranz]

[docs]

To verify Ops Manager image was built and uploaded to Minishift registry:

[jupittma@jupittma simple-test-opsmanager-k8s]$ docker images
REPOSITORY                                                  TAG                 IMAGE ID            CREATED             SIZE
simple-test-opsmanager-k8s                                  beta                0c8f2b5a38ab        2 minutes ago       1.4 GB
docker.io/debian                                            jessie-slim         f1ff1c889d54        7 weeks ago         79.2 MB