Ops need to authenticate to Vault to manage PKI, credentials, mounts, policies.
This is covered by the 'admin' policy.
To facilitate the authentication, this script allows each ops member to issue
such token as a self-service facility.
Usage: sudo utils/vault/issue-admin-token.py [--insecure]
The --insecure argument allows to use this script even if the TLS certificate
has expired. That's required to issue through Vault a new certificate.
Ref T1975