fix: use native namespace to avoid pkg_resources warnings (#1176)

* fix: use native namespace to avoid pkg_resources warnings

* remove comment header of empty files

* bring in line with auth library changes

* lint

* fix coverage

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* add tests and remove namespace_packages in setup.py

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* mark this as a system test

* remove test for now

* remove obsolete namespace list

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

.coveragerc

@@ -18,6 +18,7 @@
 [run]
 branch = True
 omit =
+  .nox/*
   google/__init__.py
   google/cloud/__init__.py
 
@@ -32,6 +33,7 @@ exclude_lines =
     # Ignore abstract methods
     raise NotImplementedError
 omit =
+  .nox/*
   */gapic/*.py
   */proto/*.py
   */core/*.py

owlbot.py

@@ -67,6 +67,12 @@
 export DUAL_REGION_LOC_1
 export DUAL_REGION_LOC_2""")
 
+s.replace(
+    ".coveragerc",
+    "omit =",
+    """omit =
+  .nox/*""")
+
 python.py_samples(skip_readmes=True)
 
 s.shell.run(["nox", "-s", "blacken"], hide_output=False)

setup.py

@@ -54,14 +54,11 @@
 # Only include packages under the 'google' namespace. Do not include tests,
 # benchmarks, etc.
 packages = [
-    package for package in setuptools.find_packages() if package.startswith("google")
+    package
+    for package in setuptools.find_namespace_packages()
+    if package.startswith("google")
 ]
 
-# Determine which namespaces are needed.
-namespaces = ["google"]
-if "google.cloud" in packages:
-    namespaces.append("google.cloud")
-
 
 setuptools.setup(
     name=name,
@@ -88,7 +85,6 @@
     ],
     platforms="Posix; MacOS X; Windows",
     packages=packages,
-    namespace_packages=namespaces,
     install_requires=dependencies,
     extras_require=extras,
     python_requires=">=3.7",