Merge branch 'JFG-724' of github.com:marknovozhilov/jagger into session-scope-in-report

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
+ refactoring : PlotsReporter's use one control tree to fetch data.
Merge branch 'master' of github.com:griddynamics/jagger into session-scope-in-report

Conflicts:
	dbapi/src/main/java/com/griddynamics/jagger/dbapi/model/rules/TreeViewGroupRule.java
+ refactor getTestGroupsNumber method with set
+ log / exception messages
+ one function to generate plots report
Merge branch 'master' of github.com:griddynamics/jagger into session-scope-in-report

Conflicts:
	chassis/core/src/main/java/com/griddynamics/jagger/engine/e1/reporting/MetricPlotsReporter.java
Merge pull request #551 from amikryukov/session-scope-in-report

JFG-724 Add a session scope plot to a report