2c007f8fa6
Motivation: We recently changed the docker config to use adoptjdk builds but missed to include the docker-sync related files. Modifications: Use adoptjdk there as well. Result: More conistent usage of JDK versions.
Using the docker images
cd /path/to/netty/
centos 6 with java 8
docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.centos-6.18.yaml run test
centos 7 with java 9
docker-compose -f docker/docker-compose.yaml -f docker/docker-compose.centos-7.19.yaml run test
etc, etc