chore(check): Add option for custom kill command in CPU and Memory hog (#348)

Signed-off-by: Udit Gaurav <udit.gaurav@mayadata.io>

charts/generic/pod-memory-hog/experiment.yaml

@@ -64,6 +64,9 @@ spec:
       ## It is used in pumba lib only    
       - name: LIB_IMAGE
         value: 'gaiaadm/pumba'
+        
+      - name: CHAOS_KILL_COMMAND
+        value: "kill -9 $(ps afx | grep \"[dd] if /dev/zero\" | awk '{print $1}' | tr '\n' ' ')"
 
       ## it defines the sequence of chaos execution for multiple target pods
       ## supported values: serial, parallel