public void setContactTimestamp(MemberIdentifier memberToCheck, long timestamp) {
      memberTimeStamps.put(memberToCheck, new TimeStamp(timestamp));
    }
when a suspect is undergoing an availability check its identifier will
be in the membersInFinalCheck collection
geode-membership/src/integrationTest/java/org/apache/geode/distributed/internal/membership/gms/fd/GMSHealthMonitorJUnitTest.java