Trim Opp database when service restarts.

When Opp service restart, we will trim the database.
a) No visible case is deleted.
b) Invisible complete outbound (failed and successful) are deleted.
c) Invisible complete failed inbound are deleted.
d) Invisible complete success inbound are deleted if needed to keep records max
to 1000.

Live folder only has received files, so the above makes sense.

Change-Id: If27080721d9abed025162ff805f661fde01564d3