[IMP] point_of_sale: allow group_pos_user to open their own pos sessions
[IMP] point_of_sale: allow group_pos_user to open their own pos sessions

Before this, users in group_pos_manager had to open sessions for users
in group_pos_user and noone really understood how that worked. So this
just simplifies everything.

Users wanting the previous behavior can easily just modify the
pos.config user ACL entry.

dfang/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,dfang/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo