Odd --no_wait behavior for workflows

[jmchilton]

Implemented in #1163. @mvdbeek do we know if anyone is using this still? I don't like that that it waits for the workflow to schedule and just skips waiting for jobs - if you're not going to wait for the jobs I think you shouldn't wait for the workflow invocation either. Does that make sense? Unless you complain I think I'm going to refactor this to really not wait - if we want to add more specific tags to not wait for jobs or not wait for subworkflows we can add those with better, more precise names to reflect their behaviors.

[mvdbeek]

Agreed, I think that might have just been the best we could do easily at the time.