usermod style tasks run when they dont need to

[martbhell]

As mentioned in PR #50:

One possible improvement to this role would be to add more conditionals to only change/run the task 1 if the GID/UID of the user (and of the logged in process or is that overkill?) are different than what is in code. If the usermod command has some nice return codes one could use those but after some searching, I couldn't find any good ones 2