drop email old former gentoo devs in favour of haskell@gentoo.org alias

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Don't put '<maintainer>' tag to metadata.xml as '<herd>' is enough

Reported-by: Manuel Rüger
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>