Introduce QDict test data file

This file is used by the QDict stress test, it adds 5k nodes
on the dictionary and performs various operations.

My original file had 21k entries and almost 400k of size. After
some discussion with Eduardo Habkost, I decided to reduce the
size.

There are ways to generate this kind of data dynamically, but
it has its problems too.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>