Add 5.3 Changelog

There was a bug fixed for this release.

Change-Id: I428a01111874c70d2151213d2b3c555444333aaa
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: Ied69074622a6d08ded39acd7e9f7949c1dbaabf8