+ create TestInfoService
+ add ability to fetch testInfo for all chosen tests in one call
 + add check for null message in ExceptionPanel
 + create hierarchy for MetricDataFetching from database
     + standard metrics: throughput, duration, avg latency, samples, success rate
     + latency metrics: Latency %d %
     + stabs for custom metrics, and validators
 + add creating of latency metric name into static method
 + bug fix with TestInfoService
Merge branch 'JFG_637_metrics_on_single_node' of github.com:dlatnikov/jagger into webui-performance

Conflicts:
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/PlotsServingBase.java
	webclient/src/main/webapp/WEB-INF/gwt-servlet.xml
+ fetching metrics with batches
+ unsupportedException in CustomMetricPlotDataProvider
- remove one method (not used) from MetricDataService
+ code cleaning
+ reduce collecting metric names as fetchers functionality
+ throw RuntimeException if something not suitable for summary metrics appears in MetricDataService.getMetrics(...)
+ compare primitive long with one string
Merge pull request #429 from amikryukov/webui-performance

JFG-609 Improvement of Web Ui performance