Remove "GTE CyberTrust Global Root" trust root and associated "Cybert…

…rust Educational CA" intermediate, both connected to the old TERENA/JANET server certificate service. All certificates issued under that arrangement will have expired by the next metadata signing (January 2013).

xml/authorities.pem

@@ -1,44 +1,4 @@
 -----BEGIN CERTIFICATE-----
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-lZPvy5TYnh+dXIVtx6quTx8itc2VrbqnzPmrC3p/
------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
-MIIEQjCCA6ugAwIBAgIEBAAD+zANBgkqhkiG9w0BAQUFADB1MQswCQYDVQQGEwJV
-UzEYMBYGA1UEChMPR1RFIENvcnBvcmF0aW9uMScwJQYDVQQLEx5HVEUgQ3liZXJU
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-EaMKByU3yUJKW3Z3UOEwUwYDVR0gBEwwSjBIBgkrBgEEAbE+AQAwOzA5BggrBgEF
-BQcCARYtaHR0cDovL3d3dy5wdWJsaWMtdHJ1c3QuY29tL0NQUy9PbW5pUm9vdC5o
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-BQADgYEAQ7NFg1RxxB/csjxrTr8m8k7yrZpb+oY3iOgUbEEYQl/vZT7rA3egt551
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-maXqnnuXmI+3zyKcs7hd5akzF3TGlzcPtOkmgl9hCz8ePWTpK5s=
------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
 MIIENjCCAx6gAwIBAgIBATANBgkqhkiG9w0BAQUFADBvMQswCQYDVQQGEwJTRTEU
 MBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFs
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