[Dovecot] v2.0 configuration paths

In Dovecot v2.0 I'm splitting dovecot-example.conf to multiple files. It's probably annoying to have tons of dovecot-*-example.conf files, so what do you think about:

1. Change default sysconfdir from $prefix/etc to $prefix/etc/dovecot (that's what most distros do anyway)

2. Install *.conf files to $sysconfdir/example/ without the "-example" part in any of the config files.

So new installations would then start with "mv example/* ."