* First pass at adding support for pipe and filter in Sieve, excluding unit tests.
* Reduce insight into copied scripts
* Added test
* Adjustments related to switch to 16.04
* Move ldap files to target dir
* Move ldap files to target dir
* Update start-mailser.sh to use copied files
* Add the domainname from container to vhost
* Fix unary operator error
* List dovecot users only when LDAP disabled
* Minor
The config file target/dovecot/dovecot.conf is not used to build the
docker-mailserver image. All tests are working without this file. The
additional config file config/dovecot.cf won’t be loaded if
target/dovecot/dovecot.conf is used.