Delete saved images during teardown of googlephotos workload. Refactor
selectPhoto helper method in googlephotos and add pause in Multiapp
workload for stability. Includes minor fixes.
Remove duplicate logging that is already captured in the standalone
workloads for Gmail and Skype. Expand comment for tagPhoto method in
Gmail workload.
A new workload for testing context switching between applications.
Uses googlephotos as the producer workload and gmail and skype as
the consumer workloads.
