OAK-108: Shortcut path conversions

Skip validation of paths in NamePathMapperImpl. Instead validate paths
in ValueFactoryImpl where the TCK (indirectly) expects names and paths
to be validated. Also the name tests in query code need updating.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1461574 13f79535-47bb-0310-9956-ffa450edef68