Revert "LP#1208613: Reset lineitem cache when resetting table"

Revert "LP#1208613: Reset lineitem cache when resetting table"

Avoid clearing the lineitem cache on each page of lineitems.  We need
the cache to for multi-page selection-to-PO support.  If the original
bugs addressed by this commit resurface, we can resolve it by
maintaining 2 caches, the stock liCache and a separate parallel cache
used just for multi-page actions.

https://bugs.launchpad.net/evergreen/+bug/1208613

https://kcevergreen.atlassian.net/browse/JBAS-673

This reverts commit 341babf860a20539529e29db252545031b01ed5f.