implement primary and secondary role, for replicationv0.5.0

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diff --git a/cmd/sigsum-log-primary/README.md b/cmd/sigsum-log-primary/README.md
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+# Run Trillian + sigsum-log-primary locally
+Trillian uses a database.  So, we will need to set that up.  It is documented
+[here](https://github.com/google/trillian#mysql-setup), and how to check that it
+is setup properly
+[here](https://github.com/google/certificate-transparency-go/blob/master/trillian/docs/ManualDeployment.md#data-storage).
+
+Other than the database we need Trillian log signer, Trillian log server, and
+sigsum-log-primary. sigsum-log-primary has been tested with trillian v.1.3.13.
+```
+$ go install github.com/google/trillian/cmd/trillian_log_signer@v1.3.13
+$ go install github.com/google/trillian/cmd/trillian_log_server@v1.3.13
+```
+
+Start Trillian log signer:
+```
+trillian_log_signer --logtostderr -v 9 --force_master --rpc_endpoint=localhost:6961 --http_endpoint=localhost:6964 --num_sequencers 1 --sequencer_interval 100ms --batch_size 100
+```
+
+Start Trillian log server:
+```
+trillian_log_server --logtostderr -v 9 --rpc_endpoint=localhost:6962 --http_endpoint=localhost:6963
+```
+
+As described in more detail
+[here](https://github.com/google/certificate-transparency-go/blob/master/trillian/docs/ManualDeployment.md#trillian-services),
+we need to provision a Merkle tree once:
+```
+$ go install github.com/google/trillian/cmd/createtree@v1.3.13
+$ createtree --admin_server localhost:6962
+<tree id>
+```
+
+Hang on to `<tree id>`.  Our sigsum-log-primary instance will use it when talking to
+the Trillian log server to specify which Merkle tree we are working against.
+
+(If you take a look in the `Trees` table you will see that the tree has been
+provisioned.)
+
+We will also need a public key-pair for sigsum-log-primary.
+```
+$ go install git.sigsum.org/sigsum-go/cmd/sigsum-debug@latest
+$ sigsum-debug key private | tee sk | sigsum-debug key public > vk
+```
+
+Start sigsum-log-primary:
+```
+$ tree_id=<tree_id>
+$ sk=<sk>
+$ sigsum-log-primary --logtostderr -v 9 --http_endpoint localhost:6965 --log_rpc_server localhost:6962 --trillian_id $tree_id --key <(echo sk)
+```
+
+Quick test:
+- curl http://localhost:6965/sigsum/v0/get-tree-head-to-cosign
+- try `submit` and `cosign` commands in `cmd/tmp`