[PATCH v3] Update btrace data in maintenance btrace commands

[Metzger, Markus T]

Hello Stephen,

>When calling `maintenance btrace packet-history` or `maintenance info btrace`,
>the commands wouldn't show any data unless it was updated previously by some
>other means, for example by running `info record`.
>To fix this, use the require_btrace function from record-brace.h which
>will update the data before returning the btrace_thread_info pointer.
>
>Change to v1: moved the require_btrace comment to record-btrace.h
>Change to v2: fix the style in the function declaration

Version 2 was already approved but I see that you have not pushed your changes, yet.

Regards,
Markus.

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