slapos.cfg.example: remove invalid signature certificate for networkcache

See also nexedi/slapos@04e5d4aa.

slapos.cfg.example

@@ -49,25 +49,11 @@ download-binary-dir-url = http://dir.shacache.org/
 #shadir-key-file = /etc/opt/slapos/shacache/shacache.key
 
 # List of signatures of uploaders we trust:
-#   Romain Courteaud
 #   Sebastien Robin
 #   Kazuhiko Shiozaki
 #   Gabriel Monnerat
 #   Test Agent Signature
 signature-certificate-list =
-  -----BEGIN CERTIFICATE-----
-  MIIB4DCCAUkCADANBgkqhkiG9w0BAQsFADA5MQswCQYDVQQGEwJGUjEZMBcGA1UE
-  CBMQRGVmYXVsdCBQcm92aW5jZTEPMA0GA1UEChMGTmV4ZWRpMB4XDTExMDkxNTA5
-  MDAwMloXDTEyMDkxNTA5MDAwMlowOTELMAkGA1UEBhMCRlIxGTAXBgNVBAgTEERl
-  ZmF1bHQgUHJvdmluY2UxDzANBgNVBAoTBk5leGVkaTCBnzANBgkqhkiG9w0BAQEF
-  AAOBjQAwgYkCgYEApYZv6OstoqNzxG1KI6iE5U4Ts2Xx9lgLeUGAMyfJLyMmRLhw
-  boKOyJ9Xke4dncoBAyNPokUR6iWOcnPHtMvNOsBFZ2f7VA28em3+E1JRYdeNUEtX
-  Z0s3HjcouaNAnPfjFTXHYj4um1wOw2cURSPuU5dpzKBbV+/QCb5DLheynisCAwEA
-  ATANBgkqhkiG9w0BAQsFAAOBgQBCZLbTVdrw3RZlVVMFezSHrhBYKAukTwZrNmJX
-  mHqi2tN8tNo6FX+wmxUUAf3e8R2Ymbdbn2bfbPpcKQ2fG7PuKGvhwMG3BlF9paEC
-  q7jdfWO18Zp/BG7tagz0jmmC4y/8akzHsVlruo2+2du2freE8dK746uoMlXlP93g
-  QUUGLQ==
-  -----END CERTIFICATE-----
   -----BEGIN CERTIFICATE-----
   MIIB8jCCAVugAwIBAgIJAPu2zchZ2BxoMA0GCSqGSIb3DQEBBQUAMBIxEDAOBgNV
   BAMMB3RzeGRldjMwHhcNMTExMDE0MTIxNjIzWhcNMTIxMDEzMTIxNjIzWjASMRAw