[Chandler-dev] do_tests.sh changed to run new test framework tests by default

[Dan Steinicke]

As of r11570 do_tests.sh no longer accepts the -N option and will just 
run functional tests using the new CATS 0.2 test framework.  Since we 
are planning on removing the old tests from the SVN tree it did not seem 
worthwhile to add an option for running them.  

Using a -N will now cause an illegal option error if used.  My apologies 
for any inconvenience this causes.

Dan