replaces default container runtime to containerd (#587)

Signed-off-by: neelanjan00 <neelanjan.manna@harness.io>

charts/generic/pod-dns-error/engine.yaml

@@ -30,11 +30,11 @@ spec:
 
             # provide the name of container runtime, it supports docker, containerd, crio
             - name: CONTAINER_RUNTIME
-              value: "docker"
+              value: 'containerd'
 
             # provide the socket file path
             - name: SOCKET_PATH
-              value: "/var/run/docker.sock"
+              value: '/run/containerd/containerd.sock'
 
              ## percentage of total pods to target
             - name: PODS_AFFECTED_PERC