LP#1208613: Reset lineitem cache when resetting table

LP#1208613: Reset lineitem cache when resetting table

Stale cache entries in this table were causing the "expand all"
functionality to break.  This might be a nuclear option, but as far as
I could see, this "cache" gets repopulated on every pagination anyway,
so I don't think we're losing anything.

To test:

[1] Select a large list from the Acquisitions --> My Selection List
    screen.
[2] Click on the Expand All button and the items on the page expand
    with more information.
[3] Click on the Next link to bring up page 2 of the list.
[4] Click on the Expand All button and verify that additional
    information is displayed.

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Erica Rohlfs <erohlfs@esilibrary.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>