Merge branch 'jn/do-not-drop-username-when-reading-from-etc-mailname' into maint

We used to stuff "user@" and then append what we read from
/etc/mailname to come up with a default e-mail ident, but a bug lost
the "user@" part.

* jn/do-not-drop-username-when-reading-from-etc-mailname:
ident: do not drop username when reading from /etc/mailname