I ran our global gitea project sync playbook across all eight gitea
hosts and one failed with a 404 against a specific project. Rerunning
the playbook against that one gitea server worked fine.
Until we sort out why this might happen lets retry our HTTP POSTs up to
3 times until they succeed.
Some numbers: We have ~2k repos and 8 servers and make two http requests
per repo for a total of 32k requests. If one fails out of that the
success rate is very high so retrying a few times should be fine.
Change-Id: I937a4f852f6713a419c03a17c3b4984a97eae0d8
177edc0abb