Release Notes for GlusterFS 3.5.2

BUG: 1104511
Change-Id: I4b9bb636c1b07fc3552785e3b4ba277fd2301ed5
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/8339
Reviewed-by: Lalatendu Mohanty <lmohanty@redhat.com>
Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>