Fixed viz tooltip position.

Fixes the position of tooltip that appears on top of the
hostgroups in workbench (sort by host). 
Initially the tooltip always appears in the center of the screen and not 
near the hostgroup, which is a ui bug.
Now the tooltip is placed exactly on the top of the host group using js absolute positioning.

Fixes: #7778

Signed-off-by: Karnan TC <kchidamb@redhat.com>