add test for JBSEAM-5127

git-svn-id: https://svn.jboss.org/repos/seam/branches/enterprise/WFK-2_1@15611 a9c07ecc-ef43-0410-a306-c911db474e88
JBSEAM-5127 added JSF2 navigation handling in case of partialRequest
adding comment why it org.jboss.seam.test.integration.faces.RestoreViewComponentAccessTest.java can fail