Add mirror config for PuChuangSida CT log

It was recently accepted by Chrome (see https://crbug.com/667663).

Author: Rob Percival

cloud/google/configs/ct-mirror-puchuangsida1.sh

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+export INSTANCE_TYPE="mirror"
+export PROJECT="ct-mirror-puchuangsida1"
+export REGION="us-central1"
+export CLUSTER="ct-mirror-puchuangsida1"
+export ZONES="a b c"
+export MIRROR_NUM_REPLICAS_PER_ZONE=2
+export MIRROR_TARGET_URL="https://www.certificatetransparency.cn/ct/"
+export MIRROR_TARGET_PUBLIC_KEY="puchuangsida_1.pem"
+export MONITORING="gcm"

cloud/keys/puchuangsida_1.pem

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArM8vS3Cs8Q2Wv+gK/kSd
+1IwXncOaEBGEE+2M+Tdtg+QAb7FLwKaJx2GPmjS7VlLKA1ZQ7yR/S0npNYHd8OcX
+9XLSI8XjE3/Xjng1j0nemASKY6+tojlwlYRoS5Ez/kzhMhfC8mG4Oo05f9WVgj5W
+GVBFb8sIMw3VGUIIGkhCEPFow8NBE8sNHtsCtyR6UZZuvAjqaa9t75KYjlXzZeXo
+nL4aR2AwfXqArVaDepPDrpMraiiKpl9jGQy+fHshY0E4t/fodnNrhcy8civBUtBb
+XTFOnSrzTZtkFJkmxnH4e/hE1eMjIPMK14tRPnKA0nh4NS1K50CZEZU01C9/+V81
+NwIDAQAB
+-----END PUBLIC KEY-----