ansible_mitogen: Make ansible_mitogens.utils a package

Prep work for ansible_mitogen.utils.unsafe

tests/ansible/tests/utils_test.py

@@ -0,0 +1,11 @@
+import unittest
+
+import ansible_mitogen.utils
+
+
+class AnsibleVersionTest(unittest.TestCase):
+    def test_ansible_version(self):
+        self.assertIsInstance(ansible_mitogen.utils.ansible_version, tuple)
+        self.assertIsInstance(ansible_mitogen.utils.ansible_version[0], int)
+        self.assertIsInstance(ansible_mitogen.utils.ansible_version[1], int)
+        self.assertEqual(2, ansible_mitogen.utils.ansible_version[0])