(refactor) add ramp_time env in generic experiments (#126)

Signed-off-by: ksatchit <ksatchit@mayadata.io>

charts/generic/pod-delete/experiment.yaml

@@ -51,6 +51,10 @@ spec:
     - name: TOTAL_CHAOS_DURATION
       value: '15'
 
+    # Period to wait before injection of chaos in sec
+    - name: RAMP_TIME
+      value: ''
+
     - name: FORCE
       value: 'true'
 
@@ -60,4 +64,4 @@ spec:
     - name: LIB
       value: ''    
     labels:
-      name: pod-delete
+      name: pod-delete