Revert "iweb: disable image uploads"

This reverts commit 1580f43853.

The upstream certificate issues are fixed

Change-Id: I6184467da6261c9258fdf745c5111acee87481be

nodepool/nodepool.yaml

@@ -56,35 +56,7 @@ providers:
     region-name: 'mtl01'
     cloud: iweb
     rate: 0.001
-    diskimages:
-      - name: centos-7
-        pause: true
-      - name: centos-8
-        pause: true
-      - name: centos-8-stream
-        pause: true
-      - name: centos-9-stream
-        pause: true
-      - name: debian-bullseye
-        pause: true
-      - name: debian-buster
-        pause: true
-      - name: fedora-34
-        pause: true
-      - name: fedora-35
-        pause: true
-      - name: gentoo-17-0-systemd
-        pause: true
-      - name: opensuse-15
-        pause: true
-      - name: opensuse-tumbleweed
-        pause: true
-      - name: ubuntu-bionic
-        pause: true
-      - name: ubuntu-focal
-        pause: true
-      - name: ubuntu-xenial
-        pause: true
+    diskimages: *provider_diskimages
 
   - name: rax-dfw
     region-name: 'DFW'