[Docker] Updated joynr-java-8 Dockerfile
[Docker] Updated joynr-java-8 Dockerfile

* joynr-java-8 now depends on new joynr-base with Fedora 36
  which has Java 17 installed as default.

* Java 11 can be removed as before as it is not needed.

* An attempt to remove Java 17 would however cause other
  packages to be removed as well.

* Java 8 must thus be configured as alternative so that java,
  javac etc. refers to Java 8 and Maven with the help of
  /home/joynr/.mavenrc also runs with Java 8.

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