Add config flag to mark that local auth info was changed

libWeave must upload changed local auth info to the server.

BUG=25766813

Change-Id: I3d82e2dab363554b1ed7ad164edbe8fbe04a7b7a
Reviewed-on: https://weave-review.googlesource.com/1801
Reviewed-by: Alex Vakulenko <avakulenko@google.com>
3 files changed