Revert "email: add support for Server Name Indication (SNI)"

This reverts commit a7a483144d466d151ab646523a22af47de10bc18.

Bug: 13744933
Change-Id: I68b95dcca20042639d02d3609ad03aaa3eca0353

Conflicts:
	emailcommon/src/com/android/emailcommon/utility/SSLSocketFactory.java
email: add support for Server Name Indication (SNI)

Change the underlaying socket factory reference to SSLCertificateSocketFactory which
has support for SNI since 4.2, and remove the access to the obsolete methods from
the old factory reference.
This change will setup the socket with a proper hostname prior to the ssl handshake.

Change-Id: Ie537b1d8c3da33de3665e481320be134939155ca
Signed-off-by: Jorge Ruesga <j.ruesga.criado@gmail.com>