Fix Android HTTP request try issue #72

src/android/src/main/java/com/RNFetchBlob/RNFetchBlobReq.java

                 clientBuilder.readTimeout(options.timeout, TimeUnit.MILLISECONDS);
             }
             clientBuilder.connectionPool(pool);
+            clientBuilder.retryOnConnectionFailure(false);
             OkHttpClient client = clientBuilder.build();
             Call call =  client.newCall(req);
             taskTable.put(taskId, call);