Improve `test_get_console_output` test
Improve `test_get_console_output` test

Skip this test if Cloudbase-Init is not set to
log anything to a Serial port.

Signed-off-by: Micu Matei-Marius <ffdce18e3aed9c8a40562979086663cc29b060a9@cloudbasesolutions.com>

stefan-caraiman/cloudbase-init-ci,micumatei/cloudbase-init-ci,cloudbase/cloudbase-init-ci