do not pass through any environment variables in the upstream tests

Author: mattsb42-aws

tox.ini

@@ -119,11 +119,13 @@ commands = {[testenv:freeze-upstream-requirements-base]commands} test/upstream-r
 [testenv:test-upstream-requirements-base]
 sitepackages = False
 recreate = True
+passenv =
 commands = {[testenv:base-command]commands} -m "local and not slow and not veryslow and not nope"
 
 # Test frozen upstream requirements for Python 2.7
 [testenv:test-upstream-requirements-py27]
 basepython = python2.7
+passenv =
 deps = -rtest/upstream-requirements-py27.txt
 sitepackages = {[testenv:test-upstream-requirements-base]sitepackages}
 recreate = {[testenv:test-upstream-requirements-base]recreate}
@@ -132,6 +134,7 @@ commands = {[testenv:test-upstream-requirements-base]commands}
 # Test frozen upstream requirements for Python 3.7
 [testenv:test-upstream-requirements-py37]
 basepython = python3.7
+passenv =
 deps = -rtest/upstream-requirements-py37.txt
 sitepackages = {[testenv:test-upstream-requirements-base]sitepackages}
 recreate = {[testenv:test-upstream-requirements-base]recreate}