Unbuffered stdout/stderr for RO

Change-Id: I84cd18d5c2d8c09557e8030c6a97e01750f0f760
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>

docker/RO/Dockerfile

@@ -99,5 +99,5 @@ HEALTHCHECK --start-period=130s --interval=10s --timeout=5s --retries=12 \
   CMD curl --silent --fail http://localhost:9090/ro || exit 1
   # CMD curl --silent --fail localhost:9090/openmano/tenants || exit 1
 # CMD /usr/bin/RO-start.sh
-CMD python3 -m osm_ng_ro.ro_main
+CMD ["python3", "-u", "-m", "osm_ng_ro.ro_main"]