Lp 1799272: Option to Limit Hold Items in SIP2 msg 64 to Available

Lp 1799272: Option to Limit Hold Items in SIP2 msg 64 to Available

This commit adds an implementation option to the oils_sip.xml that,
when enabled, will limit the hold items list and hold items counts in
the patron information response (response 64) to only the holds
available for pickup by the patron.  When the setting is not enabled,
the full list of the patron's holds continues to be used.

Signed-off-by: Jason Stephenson <jason@sigio.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>