Ensure successful storage of crypto materials from indy-key-management docker image

[surabhi-dudhediya]

Describe the bug Indy key management docker image generates identity crypto materials and stores it into Vault. It does not ensures successful storage of crypto materials in vault. As a developer I want to check and ensure that the store certs are successfully storing the cryto materials in vault.

Expected behavior

1. Checks to ensure cryto successfully stored
2. Retry logic based on the above check
3. Add retry logic for reading from vault

Additional context https://hub.docker.com/r/hyperledgerlabs/indy-key-mgmt

[TonyRowntree]

I would like to work on this