v0.5.0

• Add a new plugin.yml variant that is compatible with the CPUManager
• Change CMD in Dockerfile to ENTRYPOINT
• Add flag to optionally return list of device nodes in Allocate() call
• Refactor device plugin to eventually handle multiple resource types
• Move plugin error retry to event loop so we can exit with a signal
• Update all vendored dependencies to their latest versions
• Fix bug that was inadvertently always disabling health checks
• Update minimal driver version to 384.81