JBIDE-14837 convert seam to use stacks for downloadRuntimes
JBIDE-14616: remove parent.relativePath
JBIDE-14439 Support Faces Config 2.2 in JBossTools XML editor

Supported new namespace and new elements/attributes of Faces Config 2.2.
JBIDE-14616 Remove <relativePath/> to parent pom
JBIDE-14105 SeamXMLModelTest JUnit Test failure

Provided validation in test environment.