Update k3s.

docs/content/user-guides/crd-acme/k3s.yml

 server:
-  image: rancher/k3s:v0.8.0
+  image: rancher/k3s:v1.17.2-k3s1
   command: server --disable-agent --no-deploy traefik
   environment:
     - K3S_CLUSTER_SECRET=somethingtotallyrandom
@@ -17,7 +17,7 @@ server:
     - 6443:6443
 
 node:
-  image: rancher/k3s:v0.8.0
+  image: rancher/k3s:v1.17.2-k3s1
   privileged: true
   links:
     - server

integration/fixtures/k8s/.gitignore

+ccm.yaml
+local-storage.yaml
+metrics-server

integration/resources/compose/k8s.yml

 server:
-  image: rancher/k3s:v0.8.0
+  image: rancher/k3s:v1.17.2-k3s1
   command: server --disable-agent --no-deploy traefik --log /output/k3s.log
   environment:
     - K3S_CLUSTER_SECRET=somethingtotallyrandom
@@ -12,7 +12,7 @@ server:
     - 6443:6443
 
 node:
-  image: rancher/k3s:v0.8.0
+  image: rancher/k3s:v1.17.2-k3s1
   privileged: true
   links:
     - server