Add new feature to enable support for the cluster demo. At the moment,
it pulls in the agl-gstrecorder feature and enables building the required
mapviewer application.
Bug-AGL: SPEC-1730
Change-Id: I18c0312eefca9bb8c591e8b8a2b8113b4e94c7fc Signed-off-by: Scott Murray <scott.murray@konsulko.com>
(cherry picked from commit af3ecc175fdb3cfbb7501ec5f1aad7718c08472a)