[bind10-dev] Make control/command module as one light-weight http server

[ZhangLikun]

Hi Michael and all,
 
I have commited the code for Control/Command module, in
/experiments/likun-control_command.

control/command module is one light weight http server.

Two http commands is used by bigtool:
GET: bigtool get module information from control/command, url is /help or
/module_name/help 

POST: bigtool send the command user inputed to control/command, the command
parameters is post, url is /module_name/command_name,

Please help to check if my implementation is restful or not. :)

And I added one picture about the communication between bigtool and
control/command module, see https://bind10.isc.org/wiki/BigtoolDesign

Thanks
Zhanglikun