Users are automatically placed in homedir now

[willnx]

This PR fixes an oddity that exists when you supply a command (or scp) when using ContainerShell from a remote system.

For instance, with normal SSH access, something like this:

ssh bob@some.server.org "pwd"

would output this:

/home/bob

With ContainerShell, users would get this output instead:

/

The simple fix is to just try and cd into their home dir before executing any supplied commands.