Fix tools/kafka-all/Dockerfile to work

[sekikn]

I tried to set up ZK and Kafka following the comments in tools/kafka-all/Dockerfile before running examples, but I came across the following error:

$ cd tools/kafka-all
$ docker build -t="apicurio/kafka-all" --rm .

...

1.019 Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist                                                                      
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Dockerfile:6                                                                                                                                                                                  
--------------------                                                                                                                                                                          
   5 |                                                                                                                                                                                        
   6 | >>> RUN yum update -y && \                                                                                                                                                             
   7 | >>>     yum install -y java-1.8.0-openjdk-devel && \            
   8 | >>>     curl http://mirror.cc.columbia.edu/pub/software/apache/kafka/2.5.0/kafka_2.12-2.5.0.tgz -o /tmp/kafka.tgz && \
   9 | >>>     tar xfz /tmp/kafka.tgz -C /usr/local && \
  10 | >>>     mv /usr/local/kafka_2.12-2.5.0 /usr/local/kafka
  11 |                                
--------------------
ERROR: failed to solve: process "/bin/sh -c yum update -y &&     yum install -y java-1.8.0-openjdk-devel &&     curl http://mirror.cc.columbia.edu/pub/software/apache/kafka/2.5.0/kafka_2.12-2.5.0.tgz -o /tmp/kafka.tgz &&     tar xfz /tmp/kafka.tgz -C /usr/local &&     mv /usr/local/kafka_2.12-2.5.0 /usr/local/kafka" did not complete successfully: exit code: 1

This is because the centos:8 image has already been deprecated, so we should use other images such as centos:stream8 instead. In addition, there seem to be other issues in that file, e.g.,

• Kafka download URL doesn't seem to work.
• Kafka's version is obsolete a bit. It should be consolidated with the one defined in pom.xml.
• Apicurio Registry's version is also obsolete. It should be consolidated with the value in run-registry.sh.
• In my environment, the --net host option for the docker commands was required to run the simple-avro example successfully.