Since commit8378fe190, we disable schema sync in a mixed cluster. The detection is done using gossiper features. We need to make sure the features are registerred, and thus can be enabled, before the bootstrapping of a non-seed node happens. Otherwise the bootstrap will hang waiting on schema sync which will not happen. Message-Id: <1505893837-27876-2-git-send-email-tgrabiec@scylladb.com> (cherry picked from commit8e46d15f91)