install-chef-suse: Allow stopping spinner with specific message

It can be "failed", and not simply "done".

Also stop spinner at the end.
install-chef-suse: Minor fixes for the new output

Some empty lines were added with timestamp in the log file.
install-chef-suse: Add check for installed cloud_admin pattern
Merge pull request #1818 from vuntz/install-chef-suse-improvements

https://github.com/crowbar/crowbar/pull/1818

Merged by devtool for cloudsleuth