Updating test release script to match quick start instructions

To make testReleaseHelp track the changes I just made to the
top-level README and quick start instructions, it now

a) sets the environment before issuing the make command
b) sets the environment using the util/quickstart/setchplenv.* script
   rather than the util/setchplenv.* script

Further TODOs:

* rewrite this from csh to bash so that we're testing the shell we
  consider most common now

* make this also test the non-quickstart case to make sure it works
  too.