Added reponse body, content type and encoding fields; Removed trailing whitespaces for some files (#567)

Signed-off-by: avaakash <as86414@gmail.com>

Signed-off-by: avaakash <as86414@gmail.com>

experiments/generic/pod-http-status-code/engine.yaml

@@ -22,7 +22,7 @@ spec:
             # set chaos interval (in sec) as desired
             - name: CHAOS_INTERVAL
               value: '10'
-            
+
             # modified status code for the http response
             # if no value is provided, a random status code from the supported code list will selected
             # if an invalid status code is provided, the experiment will fail
@@ -33,7 +33,10 @@ spec:
             #  whether to modify the body as per the status code provided
             - name: "MODIFY_RESPONSE_BODY"
               value: "true"
-            
+
+            # provide the body string to overwrite the response body. This will be used only if MODIFY_RESPONSE_BODY is set to true
+            - name: RESPONSE_BODY
+              value: ''
             # port of the target service
             - name: TARGET_SERVICE_PORT
               value: "80"
@@ -51,4 +54,3 @@ spec:
             - name: PODS_AFFECTED_PERC
               value: ''
 
-