A timing/profiling utility for savanna

Created a simple function decorator that allows for the given
function to be timed.  This will facilitate some profiling work
with the aim of improving the performance of plugins.

Implements blueprint simple-timing-profiling-utility

Change-Id: Ib5a85b053a6a09fbf5d2dd1fefe8a8163c5b18e5
Merge "A timing/profiling utility for savanna"