Stop using SSL BIO.

This type of BIO is not support in BoringSSL. Also, it is not really
needed: the same can achieved with an ordinary connect BIO that is added
to an SSL object.  This form is backward compatible with OpenSSL and
therefore preferable.

Bug: 22373707
Change-Id: Ib140da3ce534c687dec1502c2cb1bb0b846bcad1
1 file changed