Removing py36 gates from zuul for nfv

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

Story: 2006796
Task: 43490
Signed-off-by: Bernardo Decco <bernardo.deccodesiqueira@windriver.com>
Change-Id: I678e8842e893f37d1897b153993085d7e5540f43

.zuul.yaml

@@ -9,7 +9,6 @@
         - openstack-tox-linters
         - nfv-tox-pep8
         - nfv-tox-py27
-        - nfv-tox-py36
         - nfv-tox-py39
         - nfv-tox-pylint
         - nova-api-proxy-tox-pep8
@@ -19,7 +18,6 @@
         - openstack-tox-linters
         - nfv-tox-pep8
         - nfv-tox-py27
-        - nfv-tox-py36
         - nfv-tox-py39
         - nfv-tox-pylint
         - nova-api-proxy-tox-pep8
@@ -39,19 +37,6 @@
       tox_envlist: py27
       tox_extra_args: -c nfv/tox.ini
 
-- job:
-    name: nfv-tox-py36
-    parent: tox
-    description: Run py36 for nfv
-    nodeset: ubuntu-bionic
-    required-projects:
-      - starlingx/fault
-    vars:
-      tox_envlist: py36
-      tox_extra_args: -c nfv/tox.ini
-      bindep_profile: test py36
-      python_version: 3.6
-
 - job:
     name: nfv-tox-py39
     parent: tox-py39