Specifically, added configuration settings for international Yahoo
domains (e.g. yahoo.ca, yahoo.de, yahoo.fr, etc), including partially
or wholly owned Yahoo subsidiaries; as well as partner domains from AT&T,
British Telecom, and Rogers whose email services are managed by Yahoo.
For domains supporting IMAP, changed to IMAP+SSL for mail handling to
support a better user experience on mobile devices.
Bug: 3258944
Original Author: Kristopher Giesing
Original CL: If5bdc70f70820f3f8aada6d2ee9b0cdb115432b5
Change-Id: Ib117f3755ff9250746f05debd1a6d1cda44c7855
ec988c2fba