install-chef-suse: Create empty repos if they don't exist
install-chef-suse: Create empty repos if they don't exist

For all the repositories listed in REPOS_SKIP_CHECKS create an empty skeleton
repository to avoid YaST complaining about missing repositories.

When CROWBAR_FROM_GIT is set also create a skeleton for the Cloud-PTF
repository. In the non CROWBAR_FROM_GIT this is handled by the crowbar RPM.

rsalevsky/crowbar,MaximilianMeister/crowbar,vwallfahrer/crowbar,rsalevsky/crowbar,nkrinner/crowbar,crowbar/crowbar,SUSE-Cloud/crowbar,rhafer/crowbar,tserong/crowbar,tserong/crowbar,SUSE-Cloud/crowbar,crowbar/crowbar,mmnelemane/crowbar,toabctl/crowbar,dirkmueller/crowbar,toabctl/crowbar,aplanas/crowbar,vwallfahrer/crowbar,aspiers/crowbar,aplanas/crowbar,aspiers/crowbar,nkrinner/crowbar,mmnelemane/crowbar,rhafer/crowbar,dirkmueller/crowbar,MaximilianMeister/crowbar,rhafer/crowbar