cmd/upspin: make share report errors even with -q
cmd/upspin: make share report errors even with -q

The -q flag is intended to suppress noise, but the old code also
suppressed genuine problems with -q was set. Now we print those
discrepancies even if quiet is set if we're not going to fix them.

Change-Id: I87ffd53fd2169715203afe8b868ab5e36aa9c16e
Reviewed-on: https://upspin-review.googlesource.com/8800
Reviewed-by: Eduardo Pinheiro <c9d6fd76b920b269b838bbb70f683c6db503d8d1@gmail.com>

upspin/upspin,upspin/upspin