Fix pending cache handling logic with write query

Fix pending cache handling logic with write query

There is a problem that the pending package information does not match
the database when the installer performs a write query request
such as writing plugin execution information
When the installer request to update the cache, the value is obtained
from the database and the cache is updated

Change-Id: Ida25b2daff5d3aefb9a2f7323d4f2a3f3650cd8c
Signed-off-by: Ilho Kim <ilho159.kim@samsung.com>