`step ca renew` doesn't handle quoted arguments in `--exec` parameter

[backerman]

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Issue details

The implementation blindly splits at spaces regardless of whether they're quoted, so the command is executed differently than e.g., if it were passed as an argument to sh -c.

Why is this needed?

I ran into this issue when trying to use curl to execute a Caddy configuration reload; in this case, it breaks the -H parameters.

I'm calling it an enhancement but this ticket could also be a bug. There's an easy workaround (put the command in a script file) so documenting the limitation would also be an acceptable fix.