Validate git tags for correct origin

[bastelfreak]

lets assume this:

• somebody clones one of our modules
• this person adds another remote, the person thinks it's a fork (it isn't)
• the person receives different git tags and pushes them to the wrong repo

This will kill our changelog generator. For every git tag we can check if it has a connection to the repo. If that's not the cause, we should send out a notification / display it in the UI.