webadmin: Tree Table subtab action panel

- Certain sub tabs which have tree panels did not properly
  report their width the the cascading action panel which
  caused weird behavior (> show with no menu etc). This patch
  changes the tables to divs so the width is reported
  correctly.

Change-Id: I65155f78d447f8a07f36118eb4d1b373ca0947cc
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1068924
Signed-off-by: Alexander Wels <awels@redhat.com>