* MSPF-445: Add Step and correct paths for step calls in keyring.py
* MSPF-445: Move installation of Step to base image and remove binary from holmes
* MSPF-445: Remove party_migration_script due to being useless and not being OTP 21 compliant
* MSPF-445: Remove last mention of party_migration_script
* MSPF-445: make keyring.py python agnostic
* MSPF-445: move to python, move ensure_* to call replace print with six version and delete six
* MSPF-445: add copy of cds_proto to Dockerfile
* MSPF-445: port ensure_binary and ensure_str from latest six
* MSPF-443: rewrite cds keyring init/unlock scripts with new proto
* MSPF-443: merge init/unlock in one script and add GetState
* MSPF-443: add check if unlock is successful
* MSPF-443: refactor unlock check
* MSPF-443: added newlines to private key files and refactored exception catching code