Construct a compliant clouds.yaml for the helper chart.

[garloff]

OK, so we now have a basic YAML parser and extractor in bash (slow). This avoids the need for python or yq (or shyaml).

Here's what we do now to avoid failing clouds.yaml construction:

• Detect the need for a cacert file
  • And extract only the last if it's huge.
  • But remove it from the constructed clouds.yaml.
• Merge the auth section from a secure.yaml file
• Extract only one cloud for the helm helper and rename it to openstack
• Store it (0600) to ~/tmp/clouds-$OS_CLOUD.yaml