Bad log_dir in hil.cfg crashes server

[ianballou]

If log_dir is set to something inappropriate, the server will crash an report Unexpected error:.
This error should report something more useful to the user. After this is fixed, perhaps it could be added to the config precheck (#966)

[zenhack]

Poked at this a little bit, this should be a simple matter of catching IOError specifically in the cli and handling it. we'll want to wait until #969 is merged though, since it will likely cause conflicts.

[naved001]

Wouldn't what I suggest here fix this?

[ianballou]

It could still crash if the directory can't be accessed. The config check in #966 will only check for malformed directories, not if they exist or not.
I do think configuring logging after validating the config file is a good idea though.

[naved001]

Fixed by #966