Refactored ops and whitelist processing into its own file (#1306)

tests/setuponlytests/whitelist_from_scratch/docker-compose.yml

@@ -0,0 +1,15 @@
+version: "3"
+
+services:
+  mc:
+    restart: "no"
+    image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
+    environment:
+      EULA: "TRUE"
+      SETUP_ONLY: "TRUE"
+      VERSION: ${MINECRAFT_VERSION:-LATEST}
+      WHITELIST: itzg
+      ENFORCE_WHITELIST: "true"
+      OVERRIDE_SERVER_PROPERTIES: "true"
+    volumes:
+      - ./data:/data

tests/setuponlytests/whitelist_from_scratch/verify.sh

@@ -0,0 +1,4 @@
+mc-image-helper assert jsonPathEquals --file=whitelist.json --path='$[0].name' --expect=itzg
+mc-image-helper assert jsonPathEquals --file=whitelist.json --path='$[0].uuid' --expect=5cddfd26-fc86-4981-b52e-c42bb10bfdef
+mc-image-helper assert propertyEquals --file=server.properties --property=white-list --expect=true
+mc-image-helper assert propertyEquals --file=server.properties --property=enforce-whitelist --expect=true