implment led for es3
add normal loopback command
move client_api lib to diag_lib
update project files
rename libdiagapi to libdg_client_api
add libdg_loop and dg_int_loop
Merge branch 'master' into ng-srx-es3
add libdg_loop interface
add dg_int_loop argument parse
add loop test api
implement internal loop test
fix dg_int_loop bug
update dg_int_loop version
add get last err for dg_loop
add libdg_dbg
use libdg_dbg
add verbose option
add signal process for dg_int_loop
add node option for dg_int_loop
add DG_LOOP_query_test()