bug 9611: use checkpw_hash() instead of md5 hash for SIP2 logins

bug 9611: use checkpw_hash() instead of md5 hash for SIP2 logins

Test:

* SIP: Have an old user and create a new user
- use either tenet sip test or
  C4/SIP/interactive_patron_check_password.pl to check old
  userid/password
- do the same for the new user

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Work as described

Test
1) using perl C4/SIP/interactive_patron_check_password.pl
can check current (short) and new (long) passwords

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>