Update to 3.0.3.
    
    - Update to 3.0.3, which contains an important security fix.  The fix is not
      embargoed but no CVE has been assigned yet.
    - Drop patches merged upstream.
    - An update of imaptest has resulted in three additional cassandane failures,
      reported upstream as https://github.com/cyrusimap/cyrus-imapd/issues/2087.
      In order to get the security fix out without delay, those three tests have been
      disabled.