Skip sanity tests that don't apply to bundled code

* add distro to pep8 skip tests
* Skip no-assert test for distro
* Add bundled distro to the empty-init skip list

test/sanity/code-smell/empty-init.py

@@ -9,9 +9,11 @@ def main():
         'test/sanity/code-smell/%s' % os.path.basename(__file__),
         # facts is grandfathered in but will break namespacing
         # the only way to fix it is to deprecate and eventually remove it
-        # six will break namespacing but because it is bundled we should not be overriding it
+        # six and distro will break namespacing but because it is bundled we should not be
+        # overriding it
         'lib/ansible/module_utils/facts/__init__.py',
         'lib/ansible/module_utils/six/__init__.py',
+        'lib/ansible/module_utils/distro/__init__.py',
     ])
 
     for path in sys.argv[1:] or sys.stdin.read().splitlines():

test/sanity/code-smell/no-assert.py

@@ -12,6 +12,7 @@ def main():
     skip = set([
         'test/sanity/code-smell/%s' % os.path.basename(__file__),
         'lib/ansible/module_utils/compat/ipaddress.py',
+        'lib/ansible/module_utils/distro/_distro.py',
     ])
 
     for path in sys.argv[1:] or sys.stdin.read().splitlines():

test/sanity/pep8/skip.txt

@@ -0,0 +1,3 @@
+# _distro.py is being bundled and we don't want to modify bundled code in our repository.
+# We can retest anytime we update the bundled copy
+lib/ansible/module_utils/distro/_distro.py