Kintsugi review comments (#2831)

* Fix makefile

* Return on invalid finalized block

* Fix todo in gossip scoring

* Require --merge for --fee-recipient

* Bump eth2_serde_utils

* Change schema versions

* Swap hash/uint256 test_random impls

* Use default for ExecutionPayload::empty

* Check for DBs before removing

* Remove kintsugi docker image

* Fix CLI default value

.github/workflows/docker-kintsugi.yml

@@ -1,45 +0,0 @@
-name: docker kintsugi
-
-on:
-    push:
-        branches:
-            - kintsugi
-
-env:
-    DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
-    DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
-    IMAGE_NAME: ${{ github.repository_owner}}/lighthouse
-    LCLI_IMAGE_NAME: ${{ github.repository_owner }}/lcli
-    BRANCH_NAME: kintsugi
-
-jobs:
-    build-docker-amd64:
-        runs-on: ubuntu-18.04
-        steps:
-            - uses: actions/checkout@v2
-            - name: Update Rust
-              run: rustup update stable
-            - name: Dockerhub login
-              run: |
-                  echo "${DOCKER_PASSWORD}" | docker login --username ${DOCKER_USERNAME} --password-stdin
-            - name: Build AMD64 dockerfile (with push)
-              run: |
-                  docker build \
-                      --build-arg PORTABLE=true \
-                      --tag ${IMAGE_NAME}:${BRANCH_NAME} \
-                      --file ./Dockerfile .
-                  docker push ${IMAGE_NAME}:${BRANCH_NAME}
-    build-docker-lcli:
-        runs-on: ubuntu-18.04
-        steps:
-            - uses: actions/checkout@v2
-            - name: Dockerhub login
-              run: |
-                  echo "${DOCKER_PASSWORD}" | docker login --username ${DOCKER_USERNAME} --password-stdin
-            - name: Build lcli dockerfile (with push)
-              run: |
-                  docker build \
-                      --build-arg PORTABLE=true \
-                      --tag ${LCLI_IMAGE_NAME}:${BRANCH_NAME} \
-                      --file ./lcli/Dockerfile .
-                  docker push ${LCLI_IMAGE_NAME}:${BRANCH_NAME}