sync: Recommend using --no-use-superproject if sync fails.

If superproject was not available for a branch, then the next
repo sync would also fail because --use-superproject is
remembered across repo init. In such cases, hoping the hint to
to use --no-use-superproject will help.

Tested the code with the following commands and by forcing
a failure.

$ ./run_tests -v

Bug: [google internal] b/187459275
Change-Id: Ie250812b7ba83afc230b5b1d154ba11f245f8b8a
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/305622
Reviewed-by: Xin Li <delphij@google.com>
Tested-by: Raman Tenneti <rtenneti@google.com>

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