Add 'repo sync -l' to only do local operations

This permits usage of 'repo sync' while offline, as we bypass the
network based portions of the code and do only the local sync.

An example use case might be:

  repo sync -n  ; # while we have network
  ... some time later ...
  repo sync -l  ; # while without network, come up to date

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

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