support/testing: add new test for python-urllib3

Importing urllib3 already allows us to check that for example zlib can
be loaded at runtime.

For good measure, also create the PoolManager object mentioned in the
user guide ([1]), and check that we can normalize a URL like it is
done in urllib3's 'test/test_util.py'.

[1]: https://urllib3.readthedocs.io/en/stable/user-guide.html

Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
Signed-off-by: Julien Olivain <ju.o@free.fr>

support/testing/tests/package/test_python_urllib3.py

@@ -0,0 +1,12 @@
+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonPy3Urllib3(TestPythonPackageBase):
+    __test__ = True
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_URLLIB3=y
+        """
+    sample_scripts = ["tests/package/sample_python_urllib3.py"]
+    timeout = 20