An unfortunate combination of `--provisioner acme` and the `--acme`
flags on `step ca init` could lead to an invalidat CA configuration.
This commit prevent this case from happening. A similar error could
occur for the `sshpop` provisioner, so a fix was implemented for that
case too.
The fix doesn't catch all cases, e.g. it doesn't check for multiple
provisioners having the same `acme-` or `sshpop-` prefix. The code
that is called is intended to be only called from a `step ca init`
invocation, so should work for these cases, but might not if the
methods are invoked at other times.
The first super admin subject can now be provided through the
`--admin-subject` flag when initializing a CA.
It's not yet possible to configure the subject of the first
super admin when provisioners are migrated from `ca.json` to the
database. This effectively limits usage of the flag to scenarios
in which the provisioners are written to the database immediately,
so when `--remote-management` is enabled. It currently also doesn't
work with Helm deployments, because there's no mechanism yet to
pass this type of option to the Helm chart.
This commit partially addresses https://github.com/smallstep/cli/issues/697
