[PATCH] Bug fix: "(ssl_crtd): Cannot add certificate to db" when updating expired cert

When ssl_crtd helper needs to add a fresh certificate to the database
but finds an expired certificate already stored, ssl_crtd deletes the
expired certificate file from disk before adding the fresh one. However,
the addition still fails because the expired certificate was not removed
from database indexes.

This fix:
   - Adds code to update database indexes upon deletion of a row.
   - Polishes certificates deletion code to avoid duplication.

This is a Measurement Factory project.