opt_parse requires all options to be before positional arguments

[marshall-mcmullen]

opt_parse currently requires all the options to be given on the command line before all positional arguments. This is inconsistent with modern GNU tools where the options can come anywhere on the command-line. We should enhance ebash to support this more flexible invocation method.

This was a limitation in the systemd wrapper at share/docker-overlay/systemd/usr/local/bin/systemctl