add internal loopback test command
add driver util system call
update req/rsp length check
add GPIO command
update test structure
add PTTM command
remove incorrect comments and unused header file
add phy command

Change-Id: I5a72f41587c1b8a504875f048e9854bd413280fa
Reviewed-on: http://10.208.24.69:8080/73
Reviewed-by: Xudong Huang <xudongh@juniper.net>
add clock command