Remove midonet job

As it's no longer relevant after FWaaS v1 removal. [1]

[1] I4e440c854e5aa11193d38946e659481f4fefded2

Related-Bug: #1814625
Change-Id: I913d87974e6b1e2ca1dda06a8b8518df88464607

.zuul.yaml

@@ -11,8 +11,6 @@
       - release-notes-jobs-python3
     check:
       jobs:
-        - neutron-fwaas-networking-midonet-cross-py35:
-            voting: false
         - legacy-neutron-fwaas-v2-dsvm-tempest
         - legacy-neutron-fwaas-dsvm-functional
         - legacy-grenade-dsvm-neutron-fwaas-multinode:
@@ -30,23 +28,6 @@
       jobs:
         - legacy-neutron-fwaas-dsvm-fullstack
 
-- job:
-    name: neutron-fwaas-networking-midonet-cross-py35
-    parent: openstack-tox-py35
-    description: |
-      Run Python 35 tests on networking-midonet repository.
-    vars:
-      zuul_work_dir: src/git.openstack.org/openstack/networking-midonet
-    required-projects:
-      - openstack/requirements
-      - openstack/networking-midonet
-      - openstack/neutron
-      - openstack/neutron-vpnaas
-      - openstack/neutron-lbaas
-      - openstack/neutron-dynamic-routing
-      - openstack/networking-l2gw
-      - openstack/tap-as-a-service
-
 - job:
     name: neutron-fwaas-fullstack
     parent: legacy-dsvm-base