log exception occurred while kernel registration
Refactor logging
Merge remote-tracking branch 'origin/gd_refactor' into gd_master

Conflicts:
	chassis/core/src/main/java/com/griddynamics/jagger/kernel/KernelRegistrar.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/server/MetricDataServiceImpl.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/server/PlotProviderServiceImpl.java