sesearch: don't clobber PYTHONPATH

Allow PYTHONPATH to be specified through the environment, this handy
for having the networkx dependency in a non-standard location for
when the user doesn't have admin rights.

Test: Uninstall networkx and run sesearch so it throws an exception on
      not being able to resolve networkx. export PYTHONPATH to point
      to a local download of networkx. Run sesearch and ensure the
      exception on networkx goes away.

Change-Id: I490ffe28e872af4a6d94103e49d487b06147f3f3
Signed-off-by: William Roberts <william.c.roberts@intel.com>
1 file changed