get rid of the message "No directory, logging in with HOME=/"

[JohannesM]

While performing operations with the user mineraft a message appears that the home directory is not available.

[IronTetsubo]

Well, good on you for fixing this (yay! Msm is active once again!), but I think you're fixing the wrong problem. This is also reported in issue #156 and in that thread I have an alternate approach. Namely, to set the msm user to not have a shell at all. This is best practice for accounts that are used to run external services (see most system services on most distros), as it eliminates a whole category of security issues by making it more difficult for any vulnerabilities in minecraft (or java) to let an attacker get to a shell. I can share more references if it's interesting. in the other issue, you can see a reference to my commit that fixes it by eliminating the interactive shell: IronTetsubo@7504ee9

Either way, you should also close out issue #156

[zachlatta]

Ideally we'd have some sort of switch for this. Although it's not as secure, logging in at the minecraft user is the only way to access the server's console through screen. Once we set it up to allow another user to access the screen session, we'll take away minecraft's shell and remove its home directory. Any comments on this?