Bug 33343: Make use of the 'autocomplete=off' attribute on password fields

Bug 33343: Make use of the 'autocomplete=off' attribute on password fields

This patch adds 'autocomplete=off' to all password type fields in the OPAC

To test:
1. Apply the patch
2. Visit http://master/cgi-bin/koha/opac-main.pl
3. Inspect the page
    --> Confirm html shows autocomplete off on the password field
4. Click on Log in (without filling any field)
5. Repeat step 3
    --> Confirm html shows autocomplete off on the password field
6. Set 'PatronSelfRegistration' system preference to 'Allow' and PatronSelfRegistrationDefaultCategory to 'Board'
7. Visit http://master/cgi-bin/koha/opac-memberentry.pl
9. Repeat step 3
    --> Confirm html shows autocomplete off on the password field
10. Connect to the OPAC
11. Click on Change password
11. Repeat step 3
    --> Confirm html shows autocomplete off on the password field
12. Set 'EnableExpiredPasswordReset' system preference to 'Enable'
13. Visit http://master/cgi-bin/koha/opac-reset-password.pl
14. Repeat step 3
    --> Confirm html shows autocomplete off on the password field

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>