Integrated vagrant dev environment

To make the development much easier i have integrated vagrant with a
SLES 12 box. This setup can only be used if you've got access to the
internal SUSE network.
Switched vagrant config to openSUSE

To open the development even for people that don't have access to the
SUSE network i have switched from SLES virtual machines to openSUSE
virtual machines and only public repositories.
Fixed path for cibadmin

For the development environment i have to prepend the cibadmin command
with a full path to /usr/sbin, else the command can not be found