Create a command.sh script in stack and zip dists to help running dropwiz commands

[at055612]

Now we have more dropwizard commands (see https://gchq.github.io/stroom-docs/user-guide/tools/command-line.html) it would be useful if the stack and zip distributions shipped with a shell script to make it easier to run them.

e.g command.sh reset_password --u USER --p PASSWORD

I.e. the script would know the location of the java binary and the config file (if needed)

[at055612]

This has been done for the docker stack.