Use stderr for prompt and stdout for command ouput in appcli keys add

[noandrea]

Summary

Use stderr to print prompt messages and stdout for output

Problem Definition

Using the command appcli keys add ... the client ask for a passphrase and confirmation on stderr and then print the result on stderr as well. Because of this, piping the output to another command becomes very difficult. For example I can use the --o json to additionally parse the output of the appcli keys add with jq but since the output is mixed with the passphrase prompt it became overly complicate to do such piping.

To be noted that the command appcli keys show does not suffer of the same issue, the passphrase is prompted on stderr and the output is printed on stdout

Proposal

Replicate the same behavior of appcli keys show to appcli keys add in regards of piping

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[alexanderbez]

cc @alessio

[alessio]

I see. The requirement makes sense to me. Will open a PR shortly.

[noandrea]

that was quick, thanks 👍