Addition of a test script which creates a Sample/test configuration for installations

Addition of a test script which creates a Sample/test configuration for installations
that wants to support SNI. Primarily done as a lot of web developers find the creation
of certificates hard - and do not want to go to the expense of sourcing a handful
from a well-known CA just for testing and experimenting.

Also update the CHANGES log with the word 'SNI' as to make googling it easier.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@620630 13f79535-47bb-0310-9956-ffa450edef68