Description of problem:

reports do not work with java 1.8.x, unsupported by jaspersoft, but /usr/share/ovirt-engine/bin/java-home acceptes java 1.8.x blindly - if available on system and set as default by "alternatives". this causes engine-setup to fail if reports are installed as 1.8.x is not supported.

imo /usr/share/ovirt-engine/bin/java-home should take into account installed reports and then exclude 1.8.x or there should be separate check for reports setup to "always" use 1.7.x.

[ INFO  ] Exporting data out of Jasper
[ ERROR ] Failed to execute stage 'Misc configuration': Command './js-export.sh' failed to execute
[ INFO  ] Stage: Clean up
          Log file is located at /var/log/ovirt-engine/setup/ovirt-engine-setup-20160331134938-z7s8ug.log
[ INFO  ] Generating answer file '/var/lib/ovirt-engine/setup/answers/20160331140054-setup.conf'
[ INFO  ] Stage: Pre-termination
[ INFO  ] Stage: Termination
[ ERROR ] Execution of setup failed


# /usr/share/ovirt-engine/bin/java-home                                                                  
/usr/lib/jvm/jre
]# /usr/lib/jvm/jre/bin/java -version                                                                                                                                                           
openjdk version "1.8.0_77"
OpenJDK Runtime Environment (build 1.8.0_77-b03)
OpenJDK 64-Bit Server VM (build 25.77-b03, mixed mode)

update-alternatives --config java and selecting 1.7.x solves the issue as default java would be 1.7.x which satisfies both engine jboss and jasper reports.

Version-Release number of selected component (if applicable):
3.6.5

How reproducible:
100%

Steps to Reproduce:
1. install openjdk 1.8.x and openjdk 1.7.x
2. ensure java -version returns 1.8.x
3. engine-setup with reports installed (i had reports for long time, so i'm not
   sure if this would be "visible" on clean env)

Actual results:
1.8.x java causes engine-setup failure as jasper reports do not support 1.8.x java

Expected results:
we should have a workaround for it when java -version returns 1.8.x as default system java and force 1.7.x for reports _EVEN_ during engine-setup (as engine-setup calls jasper scripts which would load default java).

Additional info: