Fix for Bug 5280 - Fix password field so that the password is masked as it is entered

Fix for Bug 5280 - Fix password field so that the password is masked as it is entered

This patch changes the password field to a password type input on
member-password.pl and adds a confirmation field to both member-password.pl
and memberentry.pl requiring that the password be re-entered to
confirm.

Client-side and server-side validation for the two password fields has been added
to both pages. Multiple error messages can now be displayed together on
member-password.pl.

If the user wishes for Koha to suggest a random password on member-password.pl
they can click a link which will remove the password-type input fields, replace
them with text-type fields, and automatically fill them with the random
password suggestion.

Follow-up fix lets the members.js correctly handling errors when there are
no mandatory fields

LR followup: fixing slight error that corrects previously reported template error.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Tested password setting/changing utilities - all work as expected and described.
Passes prove t xt t/db_dependent tests congruent with current master failures (adds no new fails).

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>