HPCC-12981 Thor may cores on second job that uses python #6966
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Unloading then reloading the pyembed plugin can lead to cores - particularly
if imported python modules such as numpy have cached data.
We hit similar issues in other embedded languages, and 'solved' them by
preventing the relevant embed plugin from unloading
Signed-off-by: Richard Chapman rchapman@hpccsystems.com