MB-13689: Add --silent flag to transfer tools
MB-13689: Add --silent flag to transfer tools

Add a flag to allow the user to decrement the logging level to error

Change-Id: I20e741ce757a7e467179b2398fd28b2daa3d7716
Reviewed-on: http://review.couchbase.org/49336
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>

couchbase/couchbase-cli,couchbase/couchbase-cli