Added *.linphone.org rootca to pem file used by tester

tester/certificates/cn/cafile.pem

@@ -18,3 +18,29 @@ axGKc0DjiJPypU/NsAf4Yu0nOnY8pHqJJCB0AWVoAPM7vGYPWpeH7LSdGZLuT9eK
 FUWGJhPnkrnklmBdVB0l7qXYjR5uf766HDkoDxuLhNifow3IYvsS+L2Y6puRQb9w
 HLMDE29mBDl0WyoX3h0yR0EiAO15V9A7I10=
 -----END CERTIFICATE-----
+
+UTN USERFirst Hardware Root CA, used for *.linphone.org
+==============================
+-----BEGIN CERTIFICATE-----
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+nfhmqA==
+-----END CERTIFICATE-----