SLING-3988 - Content Navigator does not show nodes with escaped names

Remove node hiding in GenericJcrRootFile . There is no side effect that
I could notice, and the tests should validate all of the cases that I
can think of.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1628811 13f79535-47bb-0310-9956-ffa450edef68