HttpURLConnector - Thresholds should be configureable.

[dvayanu]

Currently HttpURLConnector thresholds are configured in the connector itself (hardcoded):

    private void initProducer() {
        ProducerRegistryFactory.getProducerRegistryInstance().registerProducer(new OnDemandStatsProducer(componentName + "-Producer", "use-case", "GET", ServiceStatsFactory.DEFAULT_INSTANCE));
        Accumulators.createAccumulator(componentName + "-AVG.1m", componentName + "-Producer", "GET", "Avg", "1m");
        Accumulators.createAccumulator(componentName + "-AVG.15m", componentName + "-Producer", "GET", "Avg", "15m");
        Accumulators.createAccumulator(componentName + "-AVG.1h", componentName + "-Producer", "GET", "Avg", "1h");
        ThresholdConditionGuard[] guards = new ThresholdConditionGuard[]{
                new DoubleBarrierPassGuard(ThresholdStatus.GREEN, 1000, GuardedDirection.DOWN),
                new DoubleBarrierPassGuard(ThresholdStatus.YELLOW, 1000, GuardedDirection.UP),
                new DoubleBarrierPassGuard(ThresholdStatus.ORANGE, 2000, GuardedDirection.UP),
                new DoubleBarrierPassGuard(ThresholdStatus.RED, 5000, GuardedDirection.UP),
                new DoubleBarrierPassGuard(ThresholdStatus.PURPLE, 20000, GuardedDirection.UP)
        };
        Thresholds.addThreshold(componentName + "-AVG.1m", componentName + "-Producer", "GET", "Avg", "1m", guards);

        DashboardsConfig dashboardsConfig = MoskitoConfigurationHolder.getConfiguration().getDashboardsConfig();
        if (dashboardsConfig == null) {
            dashboardsConfig = new DashboardsConfig();
        }
        if (dashboardsConfig.getDashboards() == null) {
            dashboardsConfig.setDashboards(new DashboardConfig[]{});
        }

        MoskitoConfigurationHolder.getConfiguration().setDashboardsConfig(dashboardsConfig);
    }

It should be moved into a separate config file (configuration for ALL instances of the connector). Additionally we could provide a possibility to override the settings for a component in component config data section, but thats not as important.