Http Server Testing: update get file status test to reflect /etc/hosts permissions

/etc/hosts permission was changed from 666 to 664, which break the tests
that relay on those permission to check the file status API.

This update the test to compare to the updated permissions.

Suggested-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>