Ensure that the 'perl-env' and 'python-env' command exit with the RC.
When the perl-env and python-env tools are executed with a command line passed to them, they would not terminate with the correct return code. This meant that their use as part of a test environment (although I'm not keen on that - they will go away eventually) would not be possible. Fortunately, it's just a matter of returning the correct code immediately after the command runs. Or I could just have used 'set -e', but didn't in the end.
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