Stop using current user in git hooks

Want to support any authentication for the git server, so use git
commiter as username for creating reviews instead of the local user
that logged in to git.

Also verify that pushed commits has a valid author in pre-receive.
This is tricky as pre-receive must do this check in the hook, because
pre-receive runs when before the objects are pushed so the server
can't read the commits, the hook must do this.

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