Commits on Mar 27, 2015

1. debugger: don't spawn child process in remote mode …

   When debug in remote mode with host:port or pid, the interface
   spawn child process also. If the debugger agent is running, will
   get following output:
   
   ```
   < Error: listen EADDRINUSE :::5858
   <     at Object.exports._errnoException (util.js:734:11)
   <     at exports._exceptionWithHostPort (util.js:757:20)
   <     at Agent.Server._listen2 (net.js:1155:14)
   <     at listen (net.js:1181:10)
   <     at Agent.Server.listen (net.js:1268:5)
   <     at Object.start (_debug_agent.js:21:9)
   <     at startup (node.js:68:9)
   <     at node.js:799:3
   ```
   
   This fix won't spawn child process and no more error message was
   shown.
   
   When use `iojs debug`, the tip information just like this:
   
   ```
   Usage: iojs debug script.js
   ```
   
   This fix will display the advance usage also:
   
   ```
   Usage: iojs debug script.js
          iojs debug <host>:<port>
          iojs debug -p <pid>
   ```

   

   JacksonTian committed Mar 27, 2015
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