install-chef-suse: Check for package installed

SUSE-Manager doesn't support patterns. The pattern requirements moved to
a package for now and the pattern just requires the single package.
Adjust the check so it's fine when the patterns-cloud-admin package is
installed.
@vuntz good point. Fixed in https://github.com/toabctl/crowbar/commit/04724399ab5dff85195a2c578910be8d9dd8da57