Bug 1998 - Fixing Bridge Set-Controller operation failure

Bug 1998 - Fixing Bridge Set-Controller operation failure

If Controller-Target already exist in the Controller table, the existing logic in setOFController
fails badly due to a very basic bug of updating a wrong table.

If the Target exist in the Controller table, the updateRow must happen only on the Bridge Table
and Not on Controller Table. That is the root-cause of the issue seen recently.

While reviewing this bug, I felt that the logic sorrounding this is unncessarily complex and I took
this opportunity to clean it a bit as well.

Change-Id: I14cd38759c16f8b444d2d14bd0b83d1df5a3b45d
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>