Switch to using a config file with ConfigParser for configuring sysres

Currently, we had to have everyone use hardcoded entries in the scripts to handle things.

Now, we have the ability to have user define a config file at the command line, as well as in current working directory, or at /etc/sysres-python/config which will need to be created by the end-user or packaging system.

An example config file is shipped as config.example.