Selenium: wait that all notifications are closed before deleting project in CreateAndDeleteProjectsTest test

[SkorikSergey]

What does this PR do?

This PR adds checking that all notifications is closed before deleting project from workspace details in unstable CreateAndDeleteProjectsTest selenium test. It seems that checking that the created projects have the status PROJECT_FOLDER does not mean that the projects are initialized and we need to wait for all notifications to close.

Report with reproduced problem:
https://ci.codenvycorp.com/view/qa/job/che-integration-tests-master-docker/173/Selenium_tests_report/

Log:

org.openqa.selenium.TimeoutException: 
Expected condition failed: waiting for visibility of element located by By.xpath: //button/span[text()='Delete'] (tried for 5 second(s) with 500 MILLISECONDS interval)
Build info: version: '3.0.1', revision: '1969d75', time: '2016-10-18 09:49:13 -0700'
System info: host: 'slave6.codenvycorp.com', ip: '127.0.0.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.10.0-514.16.1.el7.x86_64', java.version: '1.8.0_102'
Driver info: org.eclipse.che.selenium.core.SeleniumWebDriver
	at org.eclipse.che.selenium.dashboard.CreateAndDeleteProjectsTest.createAndDeleteProjectTest(CreateAndDeleteProjectsTest.java:102)

[dmytro-ndp]

please, correct the method name waitPopUpPanelsIsClosed > waitPopupPanelsAreClosed