Switch zuul container images to quay.io

Zuul is moving its container image hosting to quay.io. Update our
docker-compose.yaml files to pull the images from this new location.

Note we don't update zuul-registry as it hasn't updated yet. A followup
change will update that container image location separately.

Change-Id: Idce7df82e811490fa5d817682479161bd74cd848

playbooks/roles/zuul-executor/files/docker-compose.yaml

@@ -5,7 +5,7 @@ version: '2'
 services:
   executor:
     restart: on-failure
-    image: docker.io/zuul/zuul-executor:latest
+    image: quay.io/zuul-ci/zuul-executor:latest
     network_mode: host
     user: zuul
     privileged: true

playbooks/roles/zuul-merger/files/docker-compose.yaml

@@ -5,7 +5,7 @@ version: '2'
 services:
   merger:
     restart: on-failure
-    image: docker.io/zuul/zuul-merger:latest
+    image: quay.io/zuul-ci/zuul-merger:latest
     network_mode: host
     user: zuul
     volumes:

playbooks/roles/zuul-preview/files/zuul-preview-docker/docker-compose.yaml

@@ -5,7 +5,7 @@ version: '2'
 services:
   zuul-preview:
     restart: always
-    image: docker.io/zuul/zuul-preview:latest
+    image: quay.io/zuul-ci/zuul-preview:latest
     network_mode: host
     environment:
       ZUUL_API_URL: https://zuul.opendev.org/

playbooks/roles/zuul-scheduler/files/docker-compose.yaml

@@ -5,7 +5,7 @@ version: '2'
 services:
   scheduler:
     restart: always
-    image: docker.io/zuul/zuul-scheduler:latest
+    image: quay.io/zuul-ci/zuul-scheduler:latest
     network_mode: host
     user: zuul
     volumes:

playbooks/roles/zuul-web/files/docker-compose.yaml

@@ -5,7 +5,7 @@ version: '2'
 services:
   web:
     restart: always
-    image: docker.io/zuul/zuul-web:latest
+    image: quay.io/zuul-ci/zuul-web:latest
     network_mode: host
     user: zuul
     volumes:
@@ -15,7 +15,7 @@ services:
       - /var/log/zuul:/var/log/zuul
   fingergw:
     restart: always
-    image: docker.io/zuul/zuul-fingergw:latest
+    image: quay.io/zuul-ci/zuul-fingergw:latest
     network_mode: host
     # fingergw needs to run as root so it can
     # grab the finger port and then drop privs