Replaced sleep statements with waitUntil statements in Mylyn Red Deer
tests.
Created class RuntimeDownloadTestBase which provides methods for
testing runtime and seam download.

RuntimeDownload test class moved to package
org.jboss.tools.runtime.as.ui.bot.test.download
Created class AllRuntimeDownload which tests downloading of all runtime
and seams and created test suited AllRuntimeDownloadTestSuite which
is running only this test class because downloading takes too much
time
Refactoring. Moving @Before and @After methods to all tests parent