Revert "Explicitly close input stream." (#217)

Reverts #216

Integration tests fails when we close input stream explicitly. We need
to dive deeper here before we can merge this change.

Author: fuatbasik

input-stream/src/main/java/software/amazon/s3/analyticsaccelerator/util/StreamUtils.java

@@ -43,8 +43,6 @@ public static byte[] toByteArray(ObjectContent objectContent) {
       while ((numBytesRead = inStream.read(buffer, 0, buffer.length)) != -1) {
         outStream.write(buffer, 0, numBytesRead);
       }
-
-      inStream.close();
     } catch (IOException e) {
       throw new RuntimeException(e);
     }