mail: split out the SMTP login to allow the keyring extension to wrap it
The keyring extension only needs to tweak this tiny section of the larger
function. But without any place to intercept the username/password fetching, it
copy/pasted the entire function, and has grown a bunch of compatibility hacks to
support older versions of Mercurial as well.
Differential Revision: https://phab.mercurial-scm.org/D10471
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