updates to VS Code launch configuration settings

• fix: vs code launch config: add killBehavior: polite entry for pwa-node configuration (#127) 1e58dfc
• fix: vs code launch config: add --disable-concurrency flag for wskdebug (#128) e75be68
  • With multiple clusters Openwhisk can create multiple containers for a concurrent action even with minimal traffic. Invocations in a cluster will create a new container in the same cluster. If invocations (actual invocation to debug vs. wskdebug polling) happen in different clusters, there will be 2 containers and they won't see each other, and wskdebug will fail to catch any invocations. Uses the activation db polling agent.