Investigate reasons of randomly not parsed java files in the selenium tests

[Ohrimenko1988]

Sometimes java files are not parsed. That's why we have randomly fails of the selenium tests which related to displaying warning marker and autocomplete. We need to investigate this problem and collect information as much as we can.

Report with reproduced problem:
https://ci.codenvycorp.com/view/qa/job/che-integration-tests-master-docker/165/Selenium_tests_report/

Screenshot:

[Ohrimenko1988]

The problem was in use "ProjectExplorer#quickExpandWithJavaSkript()" method which expands project explorer tree by using "JavaSkript". It does not emulate the clicks on each node and some events may be not launched. This may be very critical for use cases where test waits for some event already after quick expand. So in this cases, we have to use "ProjectExplorer#expandPathInProjectExplorer(String path)" method, which emulates the native clicks.