objectcache: detect default getWithSetCallback() set options

objectcache: detect default getWithSetCallback() set options

This works by setting a callback to return the cache set
options. The callback will watch DB reads and create a
merged result from said usage.

This handles callers that are missing getCacheSetOptions().

Change-Id: Ia264f011e45e8cf105480955dad7e2c4c2357b73