cbuildbot: upload_symbols: log equivalent command
cbuildbot: upload_symbols: log equivalent command

This helps w/debugging.

BUG=None
TEST=`cbuildbot daisy-release` shows log line
TEST=`./buildbot/run_tests` passes

Change-Id: Ibd82091e00b3a05e85b6ab2350e53c3e57f1f562
Reviewed-on: https://chromium-review.googlesource.com/186881
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Commit-Queue: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite