GitHub API can serve old data if depended calls are executed.

[RadekManak]

We have seen failures where the cause was GitHub not having fully processed data from our previous call.

1. Unable to open the pull request, the push was not fuly processed.

Failed to create a pull request: 422 Validation Failed
 Response: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"No commits between openshift:master and openshift-metal3:ironic-bot-master"}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request"}

2. The pull request was opened, but did not contain new commits.
   Merge https://github.com/openstack/ironic-python-agent:master (c274869) into master openshift/openstack-ironic-python-agent#14