Unpause arm64 builds

The dib 2.14.0 release should have reverted the change that was making
networking not start on images.  Unpause ARM64 for initial testing.

Change-Id: Ia7ed9972852241651bae3b9829b621f3508ed007

nodepool/nb03.openstack.org.yaml

@@ -18,7 +18,7 @@ providers:
     rate: 0.25
     diskimages:
       - name: ubuntu-xenial-arm64
-        pause: true
+        pause: false
         config-drive: true
         meta:
           hw_firmware_type: uefi
@@ -26,7 +26,7 @@ providers:
           hw_disk_bus: scsi
           hw_scsi_model: virtio-scsi
       - name: debian-stretch-arm64
-        pause: true
+        pause: false
         config-drive: true
         meta:
           hw_firmware_type: uefi