CI failed to use javac 1.8

[Roy Golan]

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]


```
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