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

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

charts/kafka/kafka-broker-disk-failure/engine.yaml

@@ -18,6 +18,10 @@ spec:
       spec:
         components:  
           env:
+            # set chaos duration (in sec) as desired
+            - name: TOTAL_CHAOS_DURATION
+              value: '60'
+
             # choose based on available kafka broker replicas           
             - name: KAFKA_REPLICATION_FACTOR
               value: '3'
@@ -74,8 +78,4 @@ spec:
             # Uses 'disk-1' attached to the node on which it is scheduled
             - name: KAFKA_BROKER
               value: 'kafka-0'
-
-            # set chaos duration (in sec) as desired
-            - name: TOTAL_CHAOS_DURATION
-              value: '60'
-              
+