security/py-cpe: Update to 1.2.0

• Update PORTVERSION and distinfo checksum (1.2.0)
• Enable building with Python 3.x
• Correct LICENSE (LGPL3)
• Enable NO_ARCH (architecture independent)
• Update COMMENT to match setup.py:summary=
• Add test target

Changes:

https://github.com/nilp0inter/cpe/blob/develop/NEWS.txt