add_subsystem_tags.cc: Add authority tag "SUB" similar to same title tag.
add_subsystem_tags.cc: Add authority tag "SUB" similar to same title tag.

ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools