JFG-737
Merge https://github.com/griddynamics/jagger into JFG-738

Conflicts:
	dbapi/src/main/java/com/griddynamics/jagger/dbapi/DatabaseServiceImpl.java
JFG-738
session scope plots have been added to the webUI
with follow features:

-Tests are sorted by startime
-Pause between end of previous test and next test also considered
Merge branch 'JFG_780_test_summary_in_PDF_via_dbservice' of https://github.com/dlatnikov/jagger into JFG-738_new
TestInfoDTO was expanded with endTime and moved to FetchUtil
Unchecked session scope plots are fixed
New hierarchy was realesed. Duplicate code was deleted.
added some comments
added plot headers
Merge https://github.com/griddynamics/jagger into JFG-738
Deleted SessionScopeDataUtil
deleted unused "imports"
Merge pull request #525 from marknovozhilov/JFG-738

JFG-738