build: Update version to 1.2.1

build: Update version to 1.2.1

Change-Id: Ib8994521a91c17d3714d0594d6fbc05e335cd82e
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14453
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jaewook Jung <jw0213.jung@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15263
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>