Updated utils to remove Avi SDK dependency and Avi 18.2.2 version update (#54894)

* Updated utils to remove Avi SDK dependency and Avi 18.2.2 version update

* Fixed the python 3.x errors failing for avi_disable_session_cache_as_fact not properly documented

* Updated version added fields for new parameters

* fixed pep8 errors

* made requests import optional

* removed setting requests to None

* Added try catch for the avi helper methods such that any import fails then module fail gracefully. This was needed to pass the requests library not found error

* removed deprecated modules. Also, trying another fix to deal with requests import error

* Fixed python3 errors

* fixed pep8, no-dict-iteritems and import test failures

* added version 2.8 for new field

* some more code cleanup and formatting

* updated the fail message and fixed plint errors

* added workaround for unicode pylint

* fixed the version added for new parameter app_learning_memory_percent and removed unicode_literals import

* Removed check of HAS_AVI for common argument spec

* Updated version added value from 2.8 to 2.9

* Version added value fixes of CI error

lib/ansible/plugins/doc_fragments/avi.py

@@ -51,6 +51,11 @@ options:
             - This allows user to perform single login and re-use the session.
         type: dict
         version_added: "2.5"
+    avi_disable_session_cache_as_fact:
+        description:
+            - It disables avi session information to be cached as a fact.
+        type: bool
+        version_added: "2.6"
 notes:
   - For more information on using Ansible to manage Avi Network devices see U(https://www.ansible.com/ansible-avi-networks).
 '''