btest should warn when using -T option but cannot create timing baseline

Description

When using "btest -T" on a system that cannot perform timing measurements there
is no warning message to notify the user that the requested operation (create a timing
baseline) cannot be performed. This is especially confusing on a Linux machine
that has the "perf" command installed, but not other required components.

Environment

None

Assignee

Unassigned

Reporter

Daniel Thayer

Labels

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External issue ID

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Components

Fix versions

Priority

Normal
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