tmf: Workaround for leaking views

tmf: Workaround for leaking views

As a workaround for Bug 490400, clear the actions bars of views that
contribute to the tool bar manager so that their actions don't retain
references to the view when it is closed.

Change-Id: I3af262aad4416e40edf587f1313c8480517541b0
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/70059
Reviewed-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>