Try running tests single-threaded to see if TravisCI failures are consistent
Try running tests single-threaded to see if TravisCI failures are consistent

Currently, I can't reproduce either of these locally:
rumor::election::five_members_elect_a_new_leader_when_they_are_quorum_partitioned
rumor::departure::two_members_share_departures

But they are consistently failing on travis

Signed-off-by: Jon Bauman <e6c6a4db54ad11b4de69fed67139594b59f3444f@users.noreply.github.com>

habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat