code review for 7067811: Update demo/sample code to state it should not be used for production

[Alan Bateman]

Nils Loodin wrote:
> Added a comment in each demo source file stating that the code below 
> is unfit for production.
> Made a separate comment blog from the copyright one to make it stand 
> out more and be more warning-like :)
>
> http://cr.openjdk.java.net/~nloodin/7067811/webrev.00/
>
> /Nisse
>
Nils - is it just demo code or do you plan to do this to sample code too 
(sample code is in src/share/sample/**)? One thing that isn't clear to 
me is why this needs to be added to every file. Seems like a warning in 
each demo's README should be sufficient.

One specific file in the webrev that might need special treatment is 
hprof_b_spec.h. That header file is essentially the "spec" to the HPROF 
binary format (sad I know). It just seems a bit strange to add a comment 
saying that it "has been deliberately simplified" to this file specifically.

-Alan.