Removing py36 gates from zuul for fault

Removing redundant py36 Zuul jobs since we now have py39 Zuul jobs in
place with the debian nodeset

Story: 2006796
Task: 43488
Signed-off-by: Bernardo Decco <bernardo.deccodesiqueira@windriver.com>
Change-Id: I66f160ca6d497cb17a3eec0ded0cea0e02698c35

.zuul.yaml

@@ -14,7 +14,6 @@
         - fault-tox-pylint
         - stx-fault-build
         - fault-rest-api-py27
-        - fault-rest-api-py36
         - fault-rest-api-py39
     gate:
       jobs:
@@ -22,7 +21,6 @@
         - openstack-tox-pep8
         - fault-tox-pylint
         - fault-rest-api-py27
-        - fault-rest-api-py36
         - fault-rest-api-py39
     post:
       jobs:
@@ -72,18 +70,6 @@
       tox_envlist: py27
       tox_extra_args: -c fm-rest-api/fm/tox.ini
 
-- job:
-    name: fault-rest-api-py36
-    parent: tox
-    description: |
-      Run py36 test for fm-rest-api
-    nodeset: ubuntu-bionic
-    required-projects:
-      - starlingx/config
-    vars:
-      tox_envlist: py36
-      tox_extra_args: -c fm-rest-api/fm/tox.ini
-
 - job:
     name: fault-rest-api-py39
     parent: tox-py39