stdnse.print_debug() enhancements

[Lionel Cons <lionel.cons () cern ch>]

stdnse.print_debug() is great to debug scripts. However, when scanning
several targets at the same time, it is impossible to find out which
debug line corresponds to which instance of which script.

I would suggest to improve the debug lines reported by Nmap to include:
 - the script name (either the file name or its declared "id")
 - a script instance id (a kind of pid)

Also, at the start of the invocation, Nmap could report which host and
port correspond to a given script id.

So, instead of seing:

 Initiating SCRIPT ENGINE at 11:58
 SCRIPT ENGINE DEBUG: hello world
 SCRIPT ENGINE DEBUG: hello world
 SCRIPT ENGINE DEBUG: hello world
 SCRIPT ENGINE DEBUG: hello world
 Completed SCRIPT ENGINE at 11:58, 3.17s elapsed

we could see something like:

 Initiating SCRIPT ENGINE at 11:58
 SCRIPT ENGINE DEBUG: started [test1.1] against target1 port nil
 SCRIPT ENGINE DEBUG: started [test1.2] against target3 port nil
 SCRIPT ENGINE DEBUG: started [test2.3] against target2 port udp/123
 SCRIPT ENGINE DEBUG: started [test2.4] against target1 port udp/234
 SCRIPT ENGINE DEBUG: [test2.3] hello world
 SCRIPT ENGINE DEBUG: [test1.2] hello world
 SCRIPT ENGINE DEBUG: [test1.1] hello world
 SCRIPT ENGINE DEBUG: [test2.4] hello world
 Completed SCRIPT ENGINE at 11:58, 3.17s elapsed

If you're afraid of the amount of lines produced, this could be
displayed only if debug > 1...

Cheers,

Lionel Cons

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