Bug#866973: cyrus-imapd 3.0 needs to be (eventually) packaged

[Boris Dušek]

Package: cyrus-imapd

cyrus-imapd 3 has been released. It has not yet been packaged for Debian. It should (eventually) be.

Release notes:
- 3.0.0: contains description of major changes since 2.5: https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.0.html
- 3.0.1: https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.1.html
- 3.0.2: https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.2.html