Run integration tests with other provider, too

- Amend and add files to run integration tests against the provider that
was not autodetected, too.
- Add check to ensure that all integration tests run against both
providers
- Run black check for all python scripts

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = black, flake8, pylint, py{26,27,36,37}
+envlist = black, flake8, pylint, py{26,27,36,37}, ensure_non_running_provider
 skipsdist = true
 skip_missing_interpreters = True
 
@@ -17,15 +17,13 @@ setenv =
     LC_ALL = C
 changedir = {toxinidir}/tests
 covtarget = network_connections
-scriptfiles = library/network_connections.py tests/test_network_connections.py
 pytesttarget = .
 
 [testenv:black]
 basepython = python3.6
 deps = black
 
-commands = black --check --diff \
-    {[base]scriptfiles}
+commands = black --check --diff --include "^[^.].*\.py$" .
 
 [testenv:py26]
 passenv = {[base]passenv}
@@ -113,6 +111,13 @@ changedir = {[base]changedir}
 commands =
     coveralls
 
+[testenv:ensure_non_running_provider]
+basepython = python3.6
+deps =
+    PyYAML
+changedir = {toxinidir}/tests
+commands = {toxinidir}/tests/ensure_non_running_provider.py
+
 [pytest]
 addopts = -rxs
 
@@ -132,5 +137,5 @@ max-line-length = 88
 python =
   2.6: py26
   2.7: py27,coveralls,flake8,pylint
-  3.6: py36,black
+  3.6: py36,black,ensure_non_running_provider
   3.7: py37