uuid: Add module for UUID generation
This commit allow modules of afb-daemon to request UUID.
This introduce an abstraction above libuuid for 3 reasons:
1. Using uuid had bad side effect inthe past because it
required enought entropy at start time, leading to hanging
initialisations in wait for enough entropy.
2. Solving bug SPEC-2625 will require use of UUID.
3. Porting to systems that haven't libuuid is made more
easy after that.
Bug-AGL: SPEC-2625
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Change-Id: I20b58cf074ca88994de049acbeb8f827359e1b69