* old docker files removed as not needed anymore
* base docker image upgraded
* mariadb version upgraded and dockerfile fixed to work with new jdks
as extended libs approach seem to be not supporte anymore
* deprecated rabbitmq default vhost config removed
(https://github.com/eclipse/hawkbit/issues/1157)
Signed-off-by: Marinov Avgustin <Avgustin.Marinov@bosch.com>
