Is your feature request related to a problem? Please describe.
create a folder src/utils for utilities that can be used by multiple applications. I think spinel, hdlc, the upcoming performance test utilities are examples of this requirement.
Additional context
https://github.com/openthread/openthread/pull/3975#discussion_r301717735
@jwhui @abtink @simonlingoogle @zhanglongxia Thoughts?
Sounds good to me.
SGTM
SGTM
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@jwhui @abtink @simonlingoogle @zhanglongxia Thoughts?