Disabling octavia-grenade job for stable/ussuri

Ussuri is in EM, we don't need a grenade job.

Change-Id: Icb04300968cd07e2a5480cc2d7bee3762992897f

zuul.d/projects.yaml

@@ -39,18 +39,6 @@
         - octavia-v2-act-stdby-dsvm-scenario:
             irrelevant-files: *irrelevant-files
             nodeset: octavia-single-node-ubuntu-bionic
-        - octavia-grenade:
-            irrelevant-files:
-              - ^.*\.rst$
-              - ^api-ref/.*$
-              - ^doc/.*$
-              - ^octavia/tests/.*$
-              - ^releasenotes/.*$
-              - ^setup.cfg$
-              - ^tools/.*$
-              - ^(test-|)requirements.txt$
-              - ^tox.ini$
-            nodeset: octavia-single-node-ubuntu-bionic
         - octavia-v2-dsvm-cinder-amphora:
             irrelevant-files: *irrelevant-files
             voting: false
@@ -85,8 +73,6 @@
             nodeset: octavia-single-node-ubuntu-bionic
         - octavia-v2-act-stdby-dsvm-scenario:
             nodeset: octavia-single-node-ubuntu-bionic
-        - octavia-grenade:
-            nodeset: octavia-single-node-ubuntu-bionic
     periodic:
       jobs:
         - publish-openstack-octavia-amphora-image-bionic: