Allow to read Phabricator token
Summary:
Can be used for API queries:
curl https://devcentral.nasqueron.org/api/... -d api.token=$(phabricator/read-token.py) ...
Test Plan: Tested against devcentral with diffusion.repository.search query.
Reviewers: dereckson
Reviewed By: dereckson
Differential Revision: https://devcentral.nasqueron.org/D2470