scripts: Add consistency check script

Add `package-consistency-check.py` script to prevent #6809 and #6815
from happening. This script takes a string present in the repository
field of packages to i

scripts: Add consistency check script

Add `package-consistency-check.py` script to prevent #6809 and #6815
from happening. This script takes a string present in the repository
field of packages to identify pacakges from a specific source.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

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