Upgrade from 2.0. to 2.2

[Jakob Curdes]

Hello, we have a centos 6 server running dovecot 2.0 provided with the 
OS, currently 2.0.9. We would like to upgrade to the 2.2.19 package 
provided by the mailserver.guru repo. I read the upgrading docs for 2.1 
and 2.2 and found the following issues:

2.0 - 2.1:
- define namespace inbox or delete 15-mailboxes.conf (we do not "care 
about special use mailboxes")
- plugins and UTF-8: we do not use one of the listed plugins
- to allow mixed usernames set auth_username_format to "nothing"
- solr backend: not used in our setup
- expire plugin: not used
- dsync: not used
2.1 - 2.2
- fts-solr: not used (?)
- autocreate: not used
- other changes: trivial or not used


Are there other things that we need to observe? Is a direct update from 
2.0.9 to 2.2.19 feasible with the above precautions or do we need to put 
in a 2.1 version in between?

Thank you for hints,
Jakob