This job just failed after merged cause it didn't find javac

http://jenkins.ovirt.org/job/ovirt-engine_3.6_check-merged-fc23-x86_64/88/console


An excerpt from the error:

```
08:55:42 [INFO] ------------------------------------------------------------------------
08:55:42 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project jboss-modules-maven-plugin: Compilation failure
08:55:42 [ERROR] Unable to locate the Javac Compiler in:
08:55:42 [ERROR] /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.92-4.b14.fc23.x86_64/jre/../lib/tools.jar
08:55:42 [ERROR] Please ensure you are using JDK 1.4 or above and
08:55:42 [ERROR] not a JRE (the com.sun.tools.javac.Main class is required).
08:55:42 [ERROR] In most cases you can change the location of your Java
08:55:42 [ERROR] installation by setting the JAVA_HOME environment variable.
08:55:42 [ERROR] -> [Help 1]

```