Bug 24913: Add PatronSelfRegistrationConfirmEmail syspref

Bug 24913: Add PatronSelfRegistrationConfirmEmail syspref

To test:
1) update database, restart memcached/plack
2) Go to Administration -> System preferences -> OPAC tab. Enable the
new PatronSelfRegistrationConfirmEmail system preference. Enable other
required self registration sysprefs.
3) Go to the OPAC home page. (You may need to log out). Click the
'Register' link so you are redirected to the member entry form.
4) Notice the 'Confirm primary email' field after the 'primary email'
field. Put 'a@a.com' in primary email, and 'b@b.com' in the confirm
field. Scroll to the end of the form and Submit.
5) Confirm the form is not successfully submitted, and an error message
is shown to indicate the email addresses do not match.
6) Confirm you cannot cut, copy or paste in either the primary email or
confirm primary email fields. Confirm the right click menu doesn't work
in these fields.

7) Disable javascript in your browser.
8) Repeat steps 3 and 4.
9) Confirm there is an error message to indicate the email addresses do
not match.

10) Re-enable javascript. Fill in the form correctly with matching email
addresses and confirm it successfully submits.

11) Disable the PatronSelfRegistrationConfirmEmail syspref.
12) Attempt to register an account on the OPAC again. Confirm the
'confirm email address' field is gone and form works as expected.
13) Re-enable the PatronSelfRegistrationConfirmEmail syspref.
14) Log in to the OPAC and go to your personal details
15) Edit the primary email field
16) Confirm you are able to submit your changes (you should not see an
error about emails not matching).

Sponsored-by: Bibliotheksservice-Zentrum Baden-Württemberg (BSZ)
Signed-off-by: holly <hc@interleaf.ie>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>