Celery 4.3 - Redis 3.2 (#2104)
Celery 4.3 - Redis 3.2 (#2104)

* Update celery from 4.1.1 to 4.3.0
* Update redis from 2.10.6 to 3.2.1
* Update flask-caching from 1.4.0 to 1.7.0
* Upgrade kombu to be compatible with celery 4.3.0
opendatateam/udata,opendatateam/udata,opendatateam/udata,etalab/udata,etalab/udata,etalab/udata