Merge "tox: Drop redundant passenv"

tox.ini

@@ -25,12 +25,6 @@ commands =
   find . -type f -name "*.py[c|o]" -delete
   stestr run {posargs}
 passenv =
-  http_proxy
-  HTTP_PROXY
-  https_proxy
-  HTTPS_PROXY
-  no_proxy
-  NO_PROXY
   OS_DEBUG
   # NOTE(sean-k-mooney) optimization is enabled by default and when enabled
   # asserts are complied out. Disable optimization to allow asserts in