tests: runtime: out_plot: added a mechanism to wait for the file so the test doesn't fail due to its undeterministic nature.
tests: runtime: out_plot: added a mechanism to wait for the file so
the test doesn't fail due to its undeterministic nature.

Signed-off-by: Leonardo Alminana <7610bae85f2b530654cc716772f1fe653373e892@calyptia.com>

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