v0.13.0

• Misc. CI build changes
• Update jsonnet library to v0.17.0 and k8s client libs to v1.17.13
• Add json formatter to the qbec alpha fmt command
• Fix diff commands to show skipped updates and deletes based on qbec directives specified for existing objects.
  This will no longer show spurious diffs for deletes and updates if those have been turned off.
• Use per-namespace queries by default when multiple namespaces are present, allow using cluster-scoped queries
  using an opt-in flag.
• The --env-file option now allows http(s) URLs in addition to local files. In addition, the envFiles attribute
  in qbec.yaml can also contain http(s) URLs.
• String data in secrets is now obfuscated in addition to binary data

Incompatibilities

This release is incompatible from previous minor versions in the following ways:

• qbec apply will now wait on all objects by default. That is, the --wait-all now defaults to true.
  To get the previous behavior, you need to add --wait-all=false to the apply command.
• qbec diff now exits 0 by default even when diffs are found. To restore previous behavior, add --error-exit
  to the command.
• qbec now defaults to per-namespace queries when multiple namespaces are present. To get the previous behavior
  of using cluster-scoped queries add clusterScopedLists: true under spec in qbec.yaml
• The command line syntax of the qbec alpha fmt command has changed in incompatible ways. Instead of options like
  --jsonnet, --yaml etc. you need to specify options as --type=jsonnet, --type=yaml and so on.
• YAML formatter now follows prettier conventions requiring arrays to be indented under the parent key.
• Any corner-case behavior from updating k8s client and jsonnet libraries.