[#309] Add configuration for storage node testnet deployment

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

Dockerfile.storage-testnet

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+FROM golang:1.14-alpine as basebuilder
+RUN apk add --update make bash
+
+FROM basebuilder as builder
+ARG BUILD=now
+ARG VERSION=dev
+ARG REPO=repository
+WORKDIR /src
+COPY . /src
+
+RUN make bin/neofs-node
+
+# Executable image
+FROM scratch AS neofs-node
+
+WORKDIR /
+
+COPY --from=builder /src/bin/neofs-node /bin/neofs-node
+COPY --from=builder /src/config/testnet/config.yml /config.yml
+
+CMD ["neofs-node", "--config", "/config.yml"]

config/testnet/README.md

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+# NEO testnet-preview4 storage node configuration
+
+There is a prepared configuration for NeoFS storage node deployment in
+NEO testnet-preview4. The Easiest way to deploy storage node is to use prepared
+docker image of storage node and run it with docker-compose.
+
+## Build image
+
+To build custom neofs-storage node image for NEO testnet-preview4:
+
+```
+neofs-node$ make image-storage-testnet
+...
+Successfully built 80ef4e3c488d
+Successfully tagged nspccdev/neofs-storage-testnet:0.14.1-dirty
+$
+```
+
+## Deploy node
+
+To run storage node in NEO testnet-preview4 environment you should deposit
+GAS assets, update docker-compose file and run it.
+
+### Deposit
+
+Storage node holder should deposit assets because it generates a bit of 
+sidechain GAS for node's wallet. Sidechain GAS used to send bootstrap tx. 
+
+To make a deposit invoke `deposit` method of NeoFS contract in testnet-preview4.
+There are three arguments in this method:
+- scripthash of the wallet
+- amount of GAS (in decimal)
+- scripthash of the storage node wallet.
+
+
+NeoFS contract scripthash in NEO testnet-preview4 is `121da848e5239d24353c7b567a719d27e0fe7c06`
+
+Last argument can be empty if you want to use
+wallet key as storage node key. See a deposit example with `neo-go`:
+
+```
+neo-go contract invokefunction -r http://neo3-preview.go.nspcc.ru:20332 \
+-w wallet.json -a NcrE6C1mvScQpAnFctK1Mw7P7i1buLCKav \
+121da848e5239d24353c7b567a719d27e0fe7c06 \
+deposit \
+0cbd9d3c3e3a3d12ff5b8bd0d3a0548c6eeac4b9 \
+int:1 \
+bytes: \
+-- 0cbd9d3c3e3a3d12ff5b8bd0d3a0548c6eeac4b9
+```
+
+### Configure
+
+Then configure docker-compose.yml file. Change endpoints values. Both of them
+should contain your public IP.
+
+```yaml
+     environment:
+       - NEOFS_NODE_ADDRESS=192.168.140.1:36512
+       - NEOFS_GRPC_ENDPOINT=192.168.140.1:36512
+```
+
+It is recommended to pass node's key as a file. To do so convert your wallet 
+WIF to 32-byte hex (via `neofs-cli` for example) and save it in file.
+
+```
+// Print WIF in a 32-byte hex format
+$ neofs-cli util keyer Kwp4Q933QujZLUCcn39tzY94itNQJS4EjTp28oAMzuxMwabm3p1s
+PrivateKey      11ab917cd99170cb8d0d48e78fca317564e6b3aaff7f7058952d6175cdca0f56
+PublicKey       02be8b2e837cab232168f5c3303f1b985818b7583682fb49026b8d2f43df7c1059
+WIF             Kwp4Q933QujZLUCcn39tzY94itNQJS4EjTp28oAMzuxMwabm3p1s
+Wallet3.0       NVKYb9UHYv9mf6gY6CkBgR5ZYPhtx5d9sr
+ScriptHash3.0   65d667398a35820f421630e49f73d7ea34952e67
+ScriptHash3.0BE 672e9534ead7739fe43016420f82358a3967d665
+
+// Save 32-byte hex into a file
+$ echo '11ab917cd99170cb8d0d48e78fca317564e6b3aaff7f7058952d6175cdca0f56' | xxd -r -p > my_wallet.key
+```
+
+Then specify path to this file in docker-compose
+```yaml
+     volumes:
+      - neofs_storage:/storage
+      - ./my_wallet.key:/node.key
+```
+
+You also can provide WIF directly with 
+`NEOFS_NODE_KEY=Kwp4Q933QujZLUCcn39tzY94itNQJS4EjTp28oAMzuxMwabm3p1s`
+env in docker-compose.
+
+### Start
+
+Run node with `docker-compose up` command and stop it with `docker-compose down`.

config/testnet/config.yml

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+logger:
+  level: info
+
+morph:
+  rpc_endpoint:
+    - http://rpc1-morph.preview4.nspcc.ru:24333
+    - http://rpc2-morph.preview4.nspcc.ru:24333
+    - http://rpc3-morph.preview4.nspcc.ru:24333
+    - http://rpc4-morph.preview4.nspcc.ru:24333
+    - http://rpc5-morph.preview4.nspcc.ru:24333
+    - http://rpc6-morph.preview4.nspcc.ru:24333
+    - http://rpc7-morph.preview4.nspcc.ru:24333
+  notification_endpoint:
+    - ws://rpc1-morph.preview4.nspcc.ru:24333/ws
+    - ws://rpc2-morph.preview4.nspcc.ru:24333/ws
+    - ws://rpc3-morph.preview4.nspcc.ru:24333/ws
+    - ws://rpc4-morph.preview4.nspcc.ru:24333/ws
+    - ws://rpc5-morph.preview4.nspcc.ru:24333/ws
+    - ws://rpc6-morph.preview4.nspcc.ru:24333/ws
+    - ws://rpc7-morph.preview4.nspcc.ru:24333/ws
+  dial_timeout: 20s
+
+bootstrap:
+  periodic:
+    enabled: true
+
+accounting:
+  scripthash: b9af268168b1546d8b1e0c25dece3faa31153058
+container:
+  scripthash: 31761cba924830bfce2662a39fc7f830b90adbef
+netmap:
+  scripthash: 7b383bc5a385859469f366b08b04b4fcd9a41f55
+node:
+  key: /node.key
+  attribute:
+    0: /external:true
+
+storage:
+  shard:
+    0:
+      use_write_cache: false
+      metabase:
+        path: /storage/metabase
+        perm: 0777
+      blobstor:
+        path: /storage/blobstor
+        perm: 0777
+        blobovnicza:
+          opened_cache_size: 32
+          shallow_depth: 1
+          shallow_width: 1

config/testnet/docker-compose.yml

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+---
+
+version: "2.4"
+services:
+  storage01:
+    image: nspccdev/neofs-storage-testnet:0.14.1
+    container_name: neofs-testnet
+    network_mode: host
+    restart: always
+    volumes:
+      - neofs_storage:/storage
+      - <NEOFS_NODE_KEY>:/node.key
+    stop_signal: SIGINT
+    environment:
+      - NEOFS_NODE_ADDRESS=<ANNOUNCE_ADDRESS>
+      - NEOFS_GRPC_ENDPOINT=<BIND_ADDRESS>
+
+volumes:
+  neofs_storage: