incompatible requirements

[johnbradley]

In trying to setup a new virtual environment I had the following error:

gcb-web-auth 0.10 has requirement PyJWT==1.5.2, 
     but you'll have pyjwt 1.4.2 which is incompatible.
gcb-web-auth 0.10 has requirement requests==2.18.1, 
    but you'll have requests 2.12.3 which is incompatible.
gcb-web-auth 0.10 has requirement requests-oauthlib==0.8.0, 
    but you'll have requests-oauthlib 0.7.0 which is incompatible.

Upgrading the versions to match gcb-web-auth's versions got past the issue.
We should see if these are still needed here or does gcb-web-auth remove the need for these requirements.

[dleehr]

These appear in the docker build logs - they're warnings not errors, but yes we should address it

[dleehr]

pyjwt and requests-oauthlib are not required by d4s2 - they're only used by gcb-web-auth, so these can be safely removed from requirements.txt.

For requests, that is not required directly by d4s2, but DukeDSClient installs requests (no version specified) and gcb-web-auth specifies requests==2.18.1. Doesn't seem like these requirements should conflict, but they still produce this warning.