7067811: Update demo/sample code to state it should not be used for production
Summary: Added comment block after copyright block stating that code is unfit for production.
Reviewed-by: ohair
The source code provided with samples and demos for the JDK is meantto illustrate the usage of a given feature or technique and has beendeliberately simplified. Additional steps required for aproduction-quality application, such as security checks, inputvalidation, and proper error handling, might not be present in thesample code.