LP#1516757: ensure that SIP2 returns DOB correctly

LP#1516757: ensure that SIP2 returns DOB correctly

Parse dates of birth using the local timezone to ensure that the date in
the database will match what is sent to SIP clients.  Otherwise, the
date will be parsed as UTC and may result in the DoB value being offset
by one day in the SIP response.

To test
-------
[1] Fire up a SIP client of some sort and retrieve a patron record;
    verify that the patron's date of birth is correct, and not
    offset by one day.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>