tests/functional: fix pylint false positives for cv2 module

Add generated-members=cv2.* to pylintrc so pylint skips member checking on the cv2 C extension module, whose members are not visible to static analysis. Silence: 2026-08-15 10:42:08,710 - INFO: qemu-test.test_pylint Checking files in /home/elmarco/src/qemu.qom-qapi/tests/functional/arm with pylint 2026-08-15 10:42:10,941 - ERROR: qemu-test.test_pylint "/home/elmarco/src/qemu.qom-qapi/tests/functional/arm/test_integratorcp.py:83: E1101: Module 'cv2' has no 'imread' member (no-member)" Note: I also tried with extension-pkg-allow-list, but that didn't work for some reason. Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20260815072421.4117291-1-marcandre.lureau@redhat.com>