[Dovecot] @2.0, --sysconfdir incorrectly populated with dovecot/*.conf

to document from #irc,

in 1.2.x, specifying

./configure ... --sysconfdir=/path/to/dir ...

correctly results in dovecot.conf looked for as "/path/to/dir/dovecot.conf".

in 2.0, dovecot incorrectly creates a dovecot dir in the sysconfdir, and looks for,

/path/to/dir/dovecot/dovecot.conf

2.0's behavior should be made consistent with the correct implementation in 1.2.x, or clarified as different in --help/docs.

thanks.