webadmin: Fixed out of frame load balancer boxes.

In the "New Scheduling Policy" dialog, extended the height of the
frame. Also, Added new css style "separatorStyle" with margins for
the seperators to adjust the style to the height change.

Change-Id: Ic4342dc06d11d0d7c884e9f6b0ecbc25b3934db5
Bug-Url: https://bugzilla.redhat.com/1142897
Signed-off-by: Tomer Saban <tsaban@redhat.com>