Simplify how to run SCTFE with fake chain and manual chain generation in README (#41)

Author: roger2hk

deployment/live/gcp/test/README.md

@@ -53,27 +53,21 @@ tool](https://github.com/google/certificate-transparency-go/blob/master/trillian
 to do this.
 
 #### Generate chains manually
-First, save the SCTFE repo's path:
 
-```bash
-export SCTFE_REPO=$(pwd)
-```
-
-Clone the [certificate-transparency-go](https://github.com/google/certificate-transparency-go) repo.
-Then, generate a chain manually. The password for the private key is `gently`:
+Generate a chain manually. The password for the private key is `gently`:
 
 ```bash
 mkdir -p /tmp/httpschain
 openssl genrsa -out /tmp/httpschain/cert.key 2048
-openssl req -new -key /tmp/httpschain/cert.key -out /tmp/httpschain/cert.csr -config=${SCTFE_REPO}/testdata/fake-ca.cfg
-openssl x509 -req -days 3650 -in /tmp/httpschain/cert.csr -CAkey ${SCTFE_REPO}/testdata/fake-ca.privkey.pem -CA  ${SCTFE_REPO}/testdata/fake-ca.cert -outform pem -out /tmp/httpschain/chain.pem -provider legacy -provider default
-cat ${SCTFE_REPO}/testdata/fake-ca.cert >> /tmp/httpschain/chain.pem
+openssl req -new -key /tmp/httpschain/cert.key -out /tmp/httpschain/cert.csr -config=testdata/fake-ca.cfg
+openssl x509 -req -days 3650 -in /tmp/httpschain/cert.csr -CAkey testdata/fake-ca.privkey.pem -CA testdata/fake-ca.cert -outform pem -out /tmp/httpschain/chain.pem -provider legacy -provider default
+cat testdata/fake-ca.cert >> /tmp/httpschain/chain.pem
 ```
 
 Finally, submit the chain to the SCTFE:
 
 ```bash
-go run ./client/ctclient upload --cert_chain=/tmp/httpschain/chain.pem --skip_https_verify --log_uri=http://localhost:6962/${TESSERA_BASE_NAME}
+go run github.com/google/certificate-transparency-go/client/ctclient@master upload --cert_chain=/tmp/httpschain/chain.pem --skip_https_verify --log_uri=http://localhost:6962/${TESSERA_BASE_NAME}
 ```
 
 #### Automatically generate chains