db_name can be used to specify storage location

[bbaugher]

The offset monitor node['kafka']['offset_monitor']['db_name'] attribute can be used to specify a different storage location for the offset monitor database by providing a full path instead of a name (/tmp/offset_monitor).

• Our docs should be updated to include this. We may want to consider re-naming the attribute
• Additional our cookbook should create the parent directory if the full path is provided