Shawn O. Pearce 96fdcef9e3 Add 'repo sync -n' to only do the network transfer
This makes it easier to update all repositories, without actually
impacting the working directory, or learning about how to use
`repo forall -c 'git fetch $REPO_REMOTE' `.

Signed-off-by: Shawn O. Pearce <sop@google.com>
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