Export additional environment variables to repo forall:

REPO_PATH is the path relative the the root of the client.

REPO_REMOTE is the name of the remote system from the manifest.

REPO_LREV is the name of the revision from the manifest, but
translated to something the local repository knows.

REPO_RREV is the name of the revision from the manifest.

This allows us to do commands like:

  repo forall -c 'echo "(cd $REPO_PATH && git checkout `git rev-parse HEAD`)"'
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