Bug 5685: Validation of email address field

Bug 5685: Validation of email address field

This patch adds server-side & client-side validation for email
form fields in the members/memberentry -view and in the
opac/memberentry-view (bootstrap).

I recently added simple validation for phone number and email address fields
for our in-house koha and saw this old bug: I'm open to any ideas on how
to do this better. Validation for phone numbers would be easy to add on
top of this but I left it out since this bug is only about the email
fields.

To test:
1) Select a member and go to any of the edit forms with email fields
(Primary info, "Library use", "Alternate address", "Alternative
contact").
2) Disable javascript in the browser in order to test server-side
validation and try to input invalid emails in each of the email form
fields.
3) Confirm that an invalid address is catched from any of the email
fields, an alert shown for each invalid address and that the member's
information was not updated with invalid data.
4) Enable javascript in the browser.
5) Confirm that the jquery validation plugin caches invalid addresses
from any of the email fields and that you cannot send the form before
correcting the problem.
6) Perform the same tests for the opac-memberentry-view.

Note: as the jQuery validation plugin doesn't exist in the bootstrap
folder, I just copied it over from the staff-client folder -how to deal
with this?

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
I have undone the changes to opac.css so that they can be submitted as a
separate patch. I have some other follow-ups to make as well.

Signed-off-by: Nicole Engard <nengard@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>