Revamped SB REST exception handling

- After some testing noticed that the current try/catch/finally
  for SB REST were not providing enough detail to debug any
  reachability problems. Fixed to catch the appropriate
  exception/causes

- Changed a few LOGs from info to debug

Change-Id: Idfabefbb5fc9b3f6795a7e4c3d25ffc404e860fb
Signed-off-by: Reinaldo Penno <rapenno@gmail.com>