Currently housekeeping timer won't be reset when we restart scylla-server. We expect the service to be run at each start, it will be consistent with upstart script in Ubuntu 14.04 When we restart scylla-server, housekeepting timer will also be restarted, so let's replace "OnBootSec" with "OnActiveSec". Fixes: #1601 Signed-off-by: Amos Kong <amos@scylladb.com> Message-Id: <a22943cc11a3de23db266c52fd476c08014098c4.1480607401.git.amos@scylladb.com>