I use command line completion when I work in git. In all repositories I have, the upsteam is always called `origin`, as this is the default from git. So typing `or<TAB>` does complete the things correctly. Since Kamailio has a tag `orig` the completion completes to `orig`, not to `origin`. This is disturbing. If I use as upstream `upstream` only for Kamailio, then the problem is seemingly gone, until I forget that I have to use `upstream` and want to type `origin`.

As there is no use for the 20 years old `orig` tag in git, delete it.