refactor(cmd-socketio-server): remove code duplication

- Move config-reading and signMessageJwt helper functions from validators to cmd-socketio-server
  to remove code duplication. Refactor validators to use these common instead of own implementation.
- Remove ValidatorAuthentication.ts that is not used anymore
  (not part of public interface, it was copied by validators during before couple commits ago).
- Updated readme with instructions of how to start asset-trade and electricity-trade samples
  without docker-compose (to be used during development).
  Added helper script for patching the config.
- Remove dependency on Indy SDK for the main build
  (it's needed only for running dockerless discounted-cartrade sample now)
- Update legacy-socketio-connector Dockerfiles to work after updates.

Signed-off-by: Michal Bajer <michal.bajer@fujitsu.com>

BUILD.md

@@ -105,7 +105,7 @@ The `npm run watch` script in action:
   * Docker Compose
   * OpenJDK (Corda support Java 8 JDK but do not currently support Java 9 or higher)
     * `sudo apt install openjdk-8-jdk-headless`
-  * Indy SDK
+  * Indy SDK (optional)
     * [Installing the SDK](https://github.com/hyperledger/indy-sdk#installing-the-sdk)
     * [Build the SDK from source](https://github.com/hyperledger/indy-sdk#how-to-build-indy-sdk-from-source)
 

examples/cactus-example-discounted-asset-trade/Dockerfile

@@ -1,6 +1,7 @@
 FROM cactus-cmd-socketio-server:latest
 
 ARG NPM_PKG_VERSION=latest
+ARG INDY_SDK_PKG_VERSION=1.16.0-dev-1649
 
 ENV APP_HOME=/root/cactus
 
@@ -9,17 +10,17 @@ WORKDIR ${APP_HOME}
 # Required by indy-sdk
 RUN apt-get update \
     && apt-get install -y libsodium23 \
-        libssl1.1 \
-        libzmq5 \
+    libssl1.1 \
+    libzmq5 \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy indy sdk lib from base ubuntu image
 # Note - indy_sdk:latest  must be ABI compatible with this image OS
 COPY --from=indy-sdk-cli:latest /usr/lib/libindy.so /usr/lib/
 
 COPY ./package.json ./dist/yarn.lock ./
-RUN yarn add "${CACTUS_CMD_SOCKETIO_PATH}" "@hyperledger/cactus-verifier-client@${NPM_PKG_VERSION}" \
-        --production --ignore-engines --non-interactive --cache-folder ./.yarnCache && \
+RUN yarn add "${CACTUS_CMD_SOCKETIO_PATH}" "@hyperledger/cactus-verifier-client@${NPM_PKG_VERSION}" "indy-sdk@${INDY_SDK_PKG_VERSION}" \
+    --production --ignore-engines --non-interactive --cache-folder ./.yarnCache && \
     rm -rf ./.yarnCache
 
 COPY ./dist ./dist/