Bug 17746: Add misc/admin/set_password.pl script

Bug 17746: Add misc/admin/set_password.pl script

This patch introduces a script that allows changing a patron's password.
The change overrides the defined password enforcement policy.

If multiple conditions are passed to match on the patron, they all need
to match. Otherwise an error message is printed.

Attributes to search the patron on:
- cardnumber
- patron_id (a.k.a. borrowernumber)
- userid

we usually know some of them, but if we specify more than one, they need
to match a patron, together.

To test:
1) Apply this patch
2) Have a known patron (i.e. you know the cardnumber, the borrowernumber
   and the userid).
3) Run:
  $ kshell
 k$ perl misc/admin/set_password.pl --cardnumber <the_card_number> \
                                    --password a_password
4) Verify you can login with the new password
5) Repeat 3) through 5) with --patron_id and --userid
=> SUCCESS: You can login in all cases
6) Try combining some or all the parameters
=> SUCCESS: It fails when it should, it succeeds when it should
7) Sign off :-D

Signed-off-by: Pierre-Marc Thibault <pierre-marc.thibault@inLibro.com>
Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>