refactor: use tox flavor to specify Celery usedevelop setting

Author: jd

tox.ini

@@ -143,7 +143,11 @@ envlist =
 #      meaning running on py3.x will fail
 #      https://stackoverflow.com/questions/57459123/why-do-i-need-to-run-tox-twice-to-test-a-python-package-with-c-extension
 commands_pre={envpython} {toxinidir}/setup.py develop
-usedevelop = True
+usedevelop =
+  # do not use develop mode with celery as running multiple python versions within
+  # same job will cause problem for tests that use ddtrace-run
+  celery_contrib: False
+  !celery_contrib: True
 
 deps =
     pdbpp
@@ -518,69 +522,6 @@ deps=
 commands=sphinx-build -W -b html docs docs/_build/html
 basepython=python
 
-# do not use develop mode with celery as running multiple python versions within
-# same job will cause problem for tests that use ddtrace-run
-[celery_contrib]
-usedevelop = False
-[testenv:celery_contrib-py27-celery31-redis210]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py34-celery31-redis210]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py35-celery31-redis210]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py36-celery31-redis210]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py27-celery40-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py27-celery40-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py27-celery41-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py27-celery41-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py34-celery40-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py34-celery40-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py34-celery41-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py34-celery41-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py35-celery40-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py35-celery40-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py35-celery41-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py35-celery41-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py36-celery40-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py36-celery40-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py36-celery41-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py36-celery41-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py27-celery42-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py34-celery42-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py35-celery42-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py36-celery42-redis210-kombu43]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py27-celery43-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py34-celery43-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py35-celery43-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py36-celery43-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-[testenv:celery_contrib-py37-celery43-redis320-kombu44]
-usedevelop = {[celery_contrib]usedevelop}
-
 [falcon_autopatch]
 setenv =
     DATADOG_SERVICE_NAME=my-falcon