Add some root CAs.

certs/eng1.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

certs/eng2.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

certs/eng3.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

certs/eng4.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

certs/eng5.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----