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docker: add gcovr to travis image
Useful for debugging if nothing else as the gcovr on the Travis images are a little old. Signed-off-by:Alex Bennée <alex.bennee@linaro.org> Reviewed-by:
Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by:
Daniel P. Berrangé <berrange@redhat.com>