title: Pip install TLS CA issue
body: <p>Every time I try to pip install something, this happens:</p>
  
  <pre><code>Lucianos-Mac:test luciano$ pip install torch
  Collecting torch
  Could not install packages due to an EnvironmentError: Could not find a suitable TLS CA certificate bundle, invalid path: /Users/luciano/Applications/NextGIS/Library/Frameworks/openssl.framework/Resources/ssl/certs/cert.pem
  </code></pre>
  
  <p>The path it references was created when I installed the gdal package from nextgis.com, which I later deleted, so the NextGIS directory does not exist. However, pip still looks there for a certificate and I don't know how to change this. I'm using Python 3.6 with Pip 19.0.3 on MacOS 10.14.</p>
  
  <p>EDIT: <code>env | grep cert</code> outputs </p>
  
  <pre><code>SSL_CERT_FILE=/Users/luciano/Applications/NextGIS/Library/Frameworks/openssl.framework/Resources/ssl/certs/cert.pem
  CURL_CA_BUNDLE=/Users/luciano/Applications/NextGIS/Library/Frameworks/openssl.framework/Resources/ssl/certs/cert.pem
  </code></pre>
  
  <p>unsetting these temporarily solve the problem, but when I restart the terminal, they are set again, and I don't know where.</p>