[DEV] Remove 'FLUSH' timeout policy
[DEV] Remove 'FLUSH' timeout policy

Never used, and will never be used.

Support is kept into libARNetwork to avoid big changes, but will never
be done in arsdk-ng

Change-Id: Ib392fc30f617362140236610d7743c3642640810
Reviewed-on: https://gerrit.parrot.biz/44494
Reviewed-by: Jean-Baptiste Dubois <3904e157e51b6776698fd1c0b3e878d58932a523@parrot.com>

Parrot-Developers/libARController,Parrot-Developers/libARController,Parrot-Developers/libARController,Parrot-Developers/libARController