Behavior before the commit
--------------------------
find_or_create define in mail module called
super if no partner is found based on the email_normalized
super call find_or_create define in base that make
a search again on the email before the creation
This cost two search every time a new partner should be created
and the search on email is less efficient than the search on
email_normalized
after the commit
----------------
Only the search on email_normalized is done before the creation
drawback: if a module that does not depends on mail module
override find_or_create the code will not be triggered anymore
the module should depends on mail module
closesodoo/odoo#65565
X-original-commit: 49d5b3813e57f2cd91d582de9b9bb534f05d2dc3
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>