webadmin: expand all expands selected node

- Added logic to find the selected node and pass
that into the node expansion method.
- Added logic to find the selected node and pass
that into the node collapse method.
- Fixed the node collapse to properly collapse all
sub nodes AND itself.

Change-Id: I110efdff51be6e5545a1de304bdce657ec5cda88
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=879291
Signed-off-by: Alexander Wels <awels@redhat.com>