/usr/lib/mysql-testsuite/std_data/crl-client-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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