Fix grammar in realm string

Note that due to a bug in Rails, HTTP authentication realms cannot contain commas :-/
Merge pull request #1808 from rhafer/master

install-chef-suse.sh: Fix REPOS_SKIP_CHECKS for CROWBAR_TESTING
Merge pull request #1807 from vuntz/grammar

https://github.com/crowbar/crowbar/pull/1807

Merged by devtool for cloudsleuth
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_TESTING is set also create a skeleton for the Cloud-PTF
repository. In the non CROWBAR_TESTING this is handled by the crowbar RPM.