chore(env): Adding required env inside chaosengine (#479)

Signed-off-by: shubhamchaudhary <shubham@chaosnative.com>

charts/openebs/openebs-pool-disk-loss/engine.yaml

@@ -17,7 +17,11 @@ spec:
     - name: openebs-pool-disk-loss
       spec:
         components:
-          env:              
+          env:  
+            # provide the total chaos duration
+            - name: TOTAL_CHAOS_DURATION
+              value: '60'    
+
             - name: APP_PVC
               value: 'demo-nginx-claim'
 
@@ -25,14 +29,6 @@ spec:
             - name: CLOUD_PLATFORM
               value: 'GKE'
 
-            # Enter the time duration in sec after the disk is dettached
-            - name: TOTAL_CHAOS_DURATION
-              value: '60'
-
-            # Period to wait before injection of chaos in sec
-            - name: RAMP_TIME
-              value: ''
-
             # Enter the project id for gcp only
             - name: PROJECT_ID 
               value: 'litmus-demo-123'
@@ -52,6 +48,4 @@ spec:
             # Enter the zone name
             - name: ZONE_NAME
               value: 'us-central1-a' 
-              
-            - name: OPENEBS_NAMESPACE
-              value: 'openebs'
+