Avoid hitting performance issues with api listing

After BZ1025320 default is provide all results
this limits results on each iteration to page_size

Related-To: http://bugzilla.redhat.com/1025320

Change-Id: I2c3cf488df334b5dcf43904a4c67f9abcbe38f87
Signed-off-by: Pablo <Pablo.Iranzo@gmail.com>