refactor and improve java installation (use openJDK)

[toschneck]

use openJDK for all images:

• JRE + Browser-Plugin for Firefox
• Don't use Orcale Installations due to http://blog.takipi.com/running-java-on-docker-youre-breaking-the-law/

remove:

### Install some basic libs and JDK8
RUN wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u112-b15/jdk-8u112-linux-x64.rpm" -O /root/jdk.rpm \
    && yum install -y /root/jdk.rpm unzip \
    && rm /root/jdk.rpm \
    && yum clean all -y
ENV JAVA_HOME /usr/java/jdk1.8.0_112

[toschneck]

also try to build a more generic build with ansible playbooks

[toschneck]

Java Installation will be removed here because is only needed for https://github.com/ConSol/sakuli/ installation, see ConSol/sakuli#218