/usr/lib/mysql-testsuite/std_data/crl-client-revoked-key.pem is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
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 | -----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
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