[Review] Request from 'schaefi' @ 'openSUSE/kiwi/review_140814_rhel7_support'

Please review the following changes:
  * f5adab9 Added oemboot description for RHEL7
  * cfb1d47 Added vmxboot description for RHEL7
  * 20e882a Use lookup function to check for initrd tools pidof/killall5
  * 4b42bfc Use menu.c32 for live ISO boot menu if not gfxboot theme exists
  * 0510c77 Use group_command=compat in yum.conf
  * 990e052 Added RHEL7 JeOS template
  * e02f1f6 Added isoboot description for RHEL7