Backport sl6.x fix to ensure correct configuration of iscsi during boot
Backport sl6.x fix to allow configuring epel_testing through variable REPOSITORY_EPEL_TESTING_ENABLED
Add all the available version of java, with the java-devel variant
Fix some default versions (used for install with 13.1.x).
Import package group definition missing from sl6.x
Merge pull request #47 from jouvin/el7.x-misc

el7.x: various changes (see commit list)