Remove platform specific jobs

Change-Id: Ia340cdf381fbed09cbf15cfd07bd367da96285f2

zuul.d/devstack-tobiko-neutron.yaml

@@ -13,11 +13,7 @@
     periodic:
       jobs:
         - devstack-tobiko-neutron
-        - devstack-tobiko-neutron-centos
-        - devstack-tobiko-neutron-fedora
         - devstack-tobiko-ovs-neutron
-        - devstack-tobiko-ovs-neutron-centos
-        - devstack-tobiko-ovs-neutron-fedora
 
 
 # --- DEFAULT ----------------------------------------------------------------
@@ -62,15 +58,3 @@
       Base Tobiko devstack job to execute scenario+faults+scenario test cases.
     vars: *FAULTS_VARS
     irrelevant-files: *FAULTS_IRRELEVANT_FILES
-
-- job:
-    name: devstack-tobiko-ovs-neutron-centos
-    parent: devstack-tobiko-ovs-neutron
-    nodeset: devstack-tobiko-multinode-fedora
-    voting: false
-
-- job:
-    name: devstack-tobiko-ovs-neutron-fedora
-    parent: devstack-tobiko-ovs-neutron
-    nodeset: devstack-tobiko-multinode-fedora
-    voting: false