Kapitan

Breaking:
- `kapitan compile` does not prune jsonnet output anymore by default (118). `--no-prune` flag has been removed and replaced with `--prune`. If you want to keep jsonnet output consistent with <0.17.0, you can do `kapitan compile --prune`.

Updates:
- Add pretty printer (`-p`) option to searchvar (121)
- Cleaned up examples (123)
- Updated requests to 2.19.1 (124)

- Updated RSA key format to PKCS8 (120)

- GPG backend cleanup (no change in usage or cli) (116)
- Improved caching (117)
- Verbose options for `inventory` and `searchvar` commands (119)

- Fixed bug with searchvar keys chain (115)

- Reclass submodule integration fixes

- Reclass update (112)