title: PM2 environment variables caching
body: <p>I am running PM2 on Ubuntu 16.04 and it seems that environment variables are being cached somehow. Is there an way of seeing which environment variables PM2 are using. The environment variables it can somehow see are not available in my terminal session anymore <code>echo $VAR_NAME</code>.</p>
  
  <p>I created the environment variables like this:</p>
  
  <pre><code>export VAR_NAME=value
  </code></pre>
  
  <p>Removing the environment variable using:</p>
  
  <pre><code>unset VAR_NAME
  </code></pre>
  
  <p>doesn't work PM2 is stubbornly holding on to the environment variable - even after various restart &amp; ssh sessions. Render me confused :-/</p>
  
  <p>Is there a way of flushing the environment variables PM2 is using? Or at least seeing which environment variables it knows about?</p>