Account for sysvinit in SLE11.

[smarlowucf]

• Testinfra has bugs that fail for SUSE.
  • Fix the location of rc?.d dirs.
  • Fix service command to run as root via sudo.
• Remove .service from names to handle SysV names.
  • testinfra automagically adds .service to name if necessary for systemctl.
• Update check_service to allow None for args. This always passes. I.e. if you only want to check if a service is enabled and it can be running or stopped.

[rjschwei]

Thanks, but SLES 11 was not really a target. There are no more service packs and SLES 11 will be gone away in about 7 months. So please don;t spend any more efforts on SLES 11.