Fix inconsistency between cache and database

Fix inconsistency between cache and database

If there is an installation process that was started
before the cache creation task was completed on the server
then that process can attempt to write directly to the database even
after the cache generation is complete and a ready flag has been created
Using inotify, watch for changes to the database
and if there is an attempt to directly write to the database
after caching has been completed, remove all cached data

Change-Id: Ibf12fe472904467a8d5a5335f8525109aa03f32f
Signed-off-by: Ilho Kim <ilho159.kim@samsung.com>