Description of problem:
After syncing a docker repository using hammer:
`hammer repository synchronize --id="666"`
the `repository info` subcommand reports sync status as success and reports 
'published at: sat6.server.com:5000/foo-bar-baz,

however, if you try to pull the repo using docker: `docker pull sat6.server.com:5000/foo-bar-baz`, you'll get:

Using default tag: latest
Trying to pull repository sat6.server.com:5000/foo-bar-baz ... 
unknown: Not Found

satellite takes some time before the repo is really available.
I believe, the sync task should finish AFTER the repo is really available.

Version-Release number of selected component (if applicable):
6.2.9

How reproducible:
always on pulling the repo just after syncing it.

Steps to Reproduce:
1. hammer repository create --product-id="1" --docker-upstream-name="busybox" --name="foo" --publish-via-http="true" --url="https://registry-1.docker.io" --content-type="docker"
2. hammer repository synchronize --id=1
3. (on a docker host with katello consumer ca installed): docker pull sat6-server.com:5000/foo-bar-baz

Actual results:
unknown: Not Found

Expected results:
repo available and pull finishes successfully

Additional info:
workaround: give satellite some time to publish the repo.