Remove DIB images from citycloud

Because citycloud is currently disable, remove images over pausing
them. This means we can clean up old DIB images left on disk for our
nodepool-builders.

Change-Id: Ide55ae65c1e152bd72dd6259bd8e7e1d308046f5
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

nodepool/nodepool.yaml

@@ -12,46 +12,25 @@ providers:
     rate: 0.25
     # Disabled until 2018-07-01 at request of citycloud.
     # We should contact them before reenabling at this date.
-    diskimages: &paused_citycloud_diskimages
-      - name: centos-7
-        pause: true
-        config-drive: true
-      - name: debian-jessie
-        pause: true
-        config-drive: true
-      - name: fedora-26
-        pause: true
-        config-drive: true
-      - name: fedora-27
-        pause: true
-        config-drive: true
-      - name: opensuse-423
-        pause: true
-        config-drive: true
-      - name: ubuntu-trusty
-        pause: true
-        config-drive: true
-      - name: ubuntu-xenial
-        pause: true
-        config-drive: true
+    diskimages: []
 
   - name: citycloud-la1
     region-name: 'La1'
     cloud: citycloud
     rate: 0.25
-    diskimages: *paused_citycloud_diskimages
+    diskimages: []
 
   - name: citycloud-lon1
     region-name: 'Lon1'
     cloud: citycloud
     rate: 0.25
-    diskimages: *paused_citycloud_diskimages
+    diskimages: []
 
   - name: citycloud-sto2
     region-name: 'Sto2'
     cloud: citycloud
     rate: 0.25
-    diskimages: *paused_citycloud_diskimages
+    diskimages: []
 
   - name: ovh-bhs1
     region-name: 'BHS1'