replaces default container runtime to containerd (#587)

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

experiments/generic/pod-io-stress/engine.yaml

@@ -30,8 +30,8 @@ spec:
 
              ## provide the cluster runtime
             - 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'     

experiments/generic/pod-io-stress/experiment.yaml

@@ -115,11 +115,11 @@ spec:
 
       ## provide the cluster runtime
       - 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'         
 
       ## it defines the sequence of chaos execution for multiple target pods
       ## supported values: serial, parallel