Pass environment explicitly

When invoking 'argo_nodeos_config run', we were passing the job
environment implicitly.  This wasn't very clean and was also causing
problems with variables such as LD_PRELOAD, which were being filtered
out because argo_nodeos_config is suid root.
2 jobs for explicit-env in 20 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #11804
py.test

00:00:11

 
  Style
passed #11805
flake8

00:00:08