[stable-2.9] Fix SSL protocol references in mqtt module. (#63654)

(cherry picked from commit 78eca0eb5d)

Co-authored-by: Matt Clay <matt@mystile.com>

changelogs/fragments/mqtt-ssl-protocols.yml

@@ -0,0 +1,2 @@
+bugfixes:
+    - Fix SSL protcol references in the ``mqtt`` module to prevent failures on Python 2.6.

lib/ansible/modules/notification/mqtt.py

@@ -142,10 +142,17 @@ from ansible.module_utils._text import to_native
 #
 
 def main():
-    tls_map = {
-        'tlsv1.2': ssl.PROTOCOL_TLSv1_2,
-        'tlsv1.1': ssl.PROTOCOL_TLSv1_1,
-    }
+    tls_map = {}
+
+    try:
+        tls_map['tlsv1.2'] = ssl.PROTOCOL_TLSv1_2
+    except AttributeError:
+        pass
+
+    try:
+        tls_map['tlsv1.1'] = ssl.PROTOCOL_TLSv1_1
+    except AttributeError:
+        pass
 
     module = AnsibleModule(
         argument_spec=dict(