Add rubygem-cstruct to the default packages to install
Limit the use of sntp to SLES

newer openSUSE releases have ntpdate again
Manage tftp via systemd on openSUSE 12.3

Enabling it via chkconfig and xinetd doesn't work on 12.3 anymore
Merge pull request #116 from rhafer/pull-req-master-36fe5284bb2a9413ccbae3d00c1b19a7612ce79c

https://github.com/crowbar/barclamp-provisioner/pull/116

Merged by devtool for rhafer