Imports of nats-qsub command

PathSynopsis
flagPackage flag implements command-line flag parsing.
github.com/nats-io/nats.goA Go client for the NATS messaging system (https://nats.io).
logPackage log implements a simple logging package.
osPackage os provides a platform-independent interface to operating system functionality.
runtimePackage runtime contains operations that interact with Go's runtime system, such as functions to control goroutines.
timePackage time provides functionality for measuring and displaying time.