Revert "Use the default SMTP port of 25, not the MSA port of 587."

This reverts commit 3f373410d7d68db94f209efb09c67e343764516f.

Conflicts:
	framework/Smtp/lib/Horde/Smtp.php

This was incorrect.  Horde_Smtp, as of 1.0.0, used 587 by default.  If
Horde the application defaulted to port 25, that needs to be addressed
at the Horde-level instantiation, not in this package.
[mms] The mail submission port (587) should be default of this library.
SMTP auth param long ago changed to boolean option

Actual auth method is automically-determined from the server.

See Ticket #13042