Update the server log settings.
void setServerLogLevelSetting
      throws SUPAdminException;
If successful, returns silently. If unsuccessful, throws SUPAdminException.
SUPCluster cluster = this.getSUPCluster();
ServerLogSettingVO vo = cluster.getServerLogSetting();
Collection<ServerLogComponentLogLevel> cvos = vo
.getComponentLogLevels();
for (ServerLogComponentLogLevel cvo : cvos) {
cvo.setLoglevel(LOG_LEVEL.WARN);
}
vo.setComponentLogLevels(cvos);
cluster.updateServerLogSetting(vo);