Correct interpretation of API Formation "command"
Correct interpretation of API Formation "command"

This is a shell-expandable string in API, not an argv.  Make the shell
invocation explicit when normalizing it to the lower level argv format,
which is still useful for "hsup run" or use with the control directory
format.

fdr/hsup-fdr,heroku/hsup,fdr/hsup-fdr,heroku/hsup