Add github eventlet/eventlet to project list
Swift has an interest in testing with eventlet master, so they can
make more progress on py3 support.
Related-Change:
# Sorting projects alphabetically will help merge conflicts.
- ansible/ansible
- cherrypy/cherrypy
+ - eventlet/eventlet
- gnocchixyz/gnocchi
- gtest-org/ansible
- kubernetes-incubator/kubespray
