JBIDE-13859 Fix deps on org.jboss.tools.ui.bot.ext to restrict version

I noticed that many of our test jobs use wrong version of bot ext from local
maven repo. This is because we weren't scrict about the required version.
I fixed this in all tests' manifests.
Fix expected code completion items for testCodeCompletionOfReferencedManagedBean method
Improves waiting for active shells when adding class path variable
Use just lower case strings for PropertiesEditorTest
Adds waiting after Properties Editor cell is activated