ci: disable vnc on IPA jobs

The CI jobs used on this pipeline are for IPA. As such, we don't need the VNC/graphical
console services operating on this project pipeline.

Graphical console is facing end users and interacting with a deployed server,
IPA is about deploying the host. There is not a valid flow which would really cross-over
the two because VNC is about connectivity for the instance which is unrelated to IPA.

Change-Id: Ic7fe4983937df8136f20f48f0f2b42d9b7e7bc6d
Signed-off-by: Julia Kreger <juliaashleykreger@gmail.com>

zuul.d/ironic-python-agent-jobs.yaml

@@ -25,6 +25,7 @@
         IRONIC_RAMDISK_TYPE: dib
       devstack_services:
         dstat: false
+        ir-novnc: False
 
 # used by diskimage-builder and IPA-builder
 - job:
@@ -53,6 +54,7 @@
         s-container: True
         s-object: True
         s-proxy: True
+        ir-novnc: False
       devstack_localrc:
         IRONIC_BOOT_MODE: uefi
         IRONIC_DEPLOY_DRIVER: redfish
@@ -97,4 +99,6 @@
         # NOTE(dtantsur): the ansible deploy doesn't depend on IPA code,
         # excluding it from the enabled list to save gate time.
         IRONIC_ENABLED_DEPLOY_INTERFACES: "direct"
+      devstack_services:
+        ir-novnc: False