Remove more leftover OpenStack references

The tox.ini still had some test environments specifically for
testing within OpenStack. This is no longer needed. Also no
longer necessary is stestr configuration that used OpenStack
variables.

Signed-off-by: Eric Brown <[email protected]>

.stestr.conf

@@ -1,4 +1,4 @@
 [DEFAULT]
-test_path=${OS_TEST_PATH:-./tests}
+test_path=./tests
 top_dir=./
-group_regex=.*(test_cert_setup)
+parallel_class=True

tox.ini

@@ -28,9 +28,6 @@ passenv =
     no_proxy
     NO_PROXY
 
-[testenv:debug]
-commands = oslo_debug_helper -t tests {posargs}
-
 [testenv:linters]
 deps = {[testenv:pep8]deps}
 usedevelop = False
@@ -87,20 +84,3 @@ deps =
     pre-commit
 commands =
     pre-commit run --all-files --show-diff-on-failure
-
-[testenv:lower-constraints]
-basepython = python3
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
-# This environment can be used to quickly validate that all needed system
-# packages required to successfully execute test targets are installed
-[testenv:bindep]
-# Do not install any requirements. We want this to be fast and work even if
-# system dependencies are missing, since it's used to tell you what system
-# dependencies are missing! This also means that bindep must be installed
-# separately, outside of the requirements files.
-deps = bindep
-commands = bindep test