consolidate 'QoS' handling

src/Makefile

src/cntlr.c

src/cntlr.h

src/cntlr_commands_impl.c

src/cntlr_qos.h

src/cntlr_tlv.c

src/cntlr_tlv_qos.c

src/config.c

src/config_qos.c

src/qos.c