change output of iot device create

[remyleone]

Description

We should:

• Make CRT printing go to the line to enable easy copy and paste
• warn the user that the private key won't be showed again
• make device a proper section

How this functionality would be exposed

References

Version

Version 2.0.0+dev
BuildDate unknown
GoVersion go1.15.2
GitBranch unknown
GitCommit unknown
GoArch amd64
GoOS darwin

[stale]

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