nodepool: reorder providers to list rax-dfw last

There are currently some image upload issues for the rax-dfw region.
Since there is an issue in nodepool that causes uploads to other
provider getting blocked by this (see [0]), move the rax providers to
the end of the list, so all other providers will be updated before
hittinh the issue.

[0] https://review.opendev.org/c/zuul/nodepool/+/922242

Change-Id: Ib8bec7ea2afd5b4569bddb9a4feea6bb07a280f3

nodepool/nodepool.yaml

@@ -54,30 +54,6 @@ providers:
     image-upload-timeout: 21600
     diskimages: *provider_diskimages
 
-  - name: rax-dfw
-    region-name: 'DFW'
-    cloud: rax
-    rate: 0.001
-    # 6 hours
-    image-upload-timeout: 21600
-    diskimages: *provider_diskimages
-
-  - name: rax-iad
-    region-name: 'IAD'
-    cloud: rax
-    rate: 0.001
-    # 6 hours
-    image-upload-timeout: 21600
-    diskimages: *provider_diskimages
-
-  - name: rax-ord
-    region-name: 'ORD'
-    cloud: rax
-    rate: 0.001
-    # 6 hours
-    image-upload-timeout: 21600
-    diskimages: *provider_diskimages
-
   - name: vexxhost-ca-ymq-1
     region-name: 'ca-ymq-1'
     cloud: vexxhost
@@ -126,6 +102,30 @@ providers:
       - name: openEuler-22-03-LTS
         config-drive: true
 
+  - name: rax-iad
+    region-name: 'IAD'
+    cloud: rax
+    rate: 0.001
+    # 6 hours
+    image-upload-timeout: 21600
+    diskimages: *provider_diskimages
+
+  - name: rax-ord
+    region-name: 'ORD'
+    cloud: rax
+    rate: 0.001
+    # 6 hours
+    image-upload-timeout: 21600
+    diskimages: *provider_diskimages
+
+  - name: rax-dfw
+    region-name: 'DFW'
+    cloud: rax
+    rate: 0.001
+    # 6 hours
+    image-upload-timeout: 21600
+    diskimages: *provider_diskimages
+
 diskimages:
   - name: base
     abstract: True