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

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

charts/generic/pod-network-corruption/engine.yaml

@@ -17,10 +17,6 @@ spec:
       spec:
         components:
           env:
-            #Network interface inside target container              
-            - name: NETWORK_INTERFACE
-              value: 'eth0'
-              
             - name: TOTAL_CHAOS_DURATION
               value: '60' # in seconds
 
@@ -33,3 +29,10 @@ spec:
             # provide the socket file path
             - name: SOCKET_PATH
               value: '/var/run/docker.sock'
+
+            - name: NETWORK_PACKET_CORRUPTION_PERCENTAGE
+              value: '100' #in PERCENTAGE
+
+            ## percentage of total pods to target
+            - name: PODS_AFFECTED_PERC
+              value: ''