MINOR: sample: Add UUID-fetch

Adds the fetch uuid(int). It returns a UUID following the format of
version 4 in the RFC4122 standard.

New feature, but could be backported.

(cherry picked from commit 8a694b859cf98f8b0855b4aa5a50ebf64b501215)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
2 files changed