/usr/lib/python2.7/dist-packages/tornado/test/test.key is in python-tornado 4.2.1-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | -----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
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