Deprecate $name param to systemuser in favor of $title

Rather than doing this for all usages and risk breaking stuff, allow
callers to still specify $name if they'd like.

Updated the gerrit usages to be a model citizen.

Change-Id: I0f9dd3d6f24b45b566fc379591294c7f90235550
Merge "Deprecate $name param to systemuser in favor of $title" into production