kunit: tool: Do not error on tests without test plans

The (K)TAP spec encourages test output to begin with a 'test plan': a
count of the number of tests being run of the form:
1..n

However, some test suites might not know the number of subtests in
advance (for example, KUnit's parameterised tests use a generator
function). In this case, it's not possible to print the test plan in
advance.

kunit_tool already parses test output which doesn't contain a plan, but
reports an error. Since we want to use nested subtests with KUnit
paramterised tests, remove this error.

Signed-off-by: David Gow <[email protected]>
Reviewed-by: Daniel Latypov <[email protected]>
Reviewed-by: Brendan Higgins <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

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