Prefer the stdlib SSLContext over urllib3 context

We do not go through the effort of finding the right PROTOCOL setting if
we have SSLContext in the stdlib.  So we do not want to hit the code
that uses PROTOCOL to set the urllib3-provided ssl context when
SSLContext is available.  Also, the urllib3 implementation appears to
have a bug in some recent versions.  Preferring the stdlib version will
work around that for those with Python-2.7.9+ as well.

Fixes ansible#26235
Fixes ansible#25402
Fixes ansible#31998

lib/ansible/module_utils/urls.py

@@ -700,10 +700,13 @@ def detect_no_proxy(self, url):
         return True
 
     def _make_context(self, to_add_ca_cert_path):
-        if HAS_URLLIB3_PYOPENSSLCONTEXT:
+        if HAS_SSLCONTEXT:
+            context = create_default_context()
+        elif HAS_URLLIB3_PYOPENSSLCONTEXT:
             context = PyOpenSSLContext(PROTOCOL)
         else:
-            context = create_default_context()
+            raise NotImplementedError('Host libraries are too old to support creating an sslcontext')
+
         if to_add_ca_cert_path:
             context.load_verify_locations(to_add_ca_cert_path)
         return context
@@ -712,8 +715,11 @@ def http_request(self, req):
         tmp_ca_cert_path, to_add_ca_cert_path, paths_checked = self.get_ca_certs()
         https_proxy = os.environ.get('https_proxy')
         context = None
-        if HAS_SSLCONTEXT or HAS_URLLIB3_PYOPENSSLCONTEXT:
+        try:
             context = self._make_context(to_add_ca_cert_path)
+        except Exception:
+            # We'll make do with no context below
+            pass
 
         # Detect if 'no_proxy' environment variable is set and if our URL is included
         use_proxy = self.detect_no_proxy(req.get_full_url())