This patch modifies the database api layer to fix the pagination
slowness bug, which causes a delay while the administrator tries
to list shares using the `--limit` option.
This change was tested in a very busy environment with 800 shares.
Before the change, the operation took about 25 seconds to be
finished. Now, the operation takes about 3 seconds in the same
environment.
Change-Id: I89659452b0e033631f1318a2eabb7e120c9e5743
Closes-bug: #1795463
57edcbd1da