Ignore jenkins-{build,fetch}-* tags when generating reprepro configuration

We still have more than 200 spurious jenkins-{build,fetch}* tags in Git. The scripts that generate our reprepro configuration translate each of those into an APT suite, making the whole process more time and resources consuming than it should.

Our previous attempts to get rid of these tags failed, as they keep being re-introduced when fetching from someone’s remote, who has not deleted it. There’s little chance we manage to get rid of it before we split the Git repo, and rewrite its history. So, these tags should be ignored.

Original created by @intrigeri on 7220 (Redmine)