Boom post config has issues with non-strings

[cjgrady]

Configuration options that are non-strings are failing. I have updated boom post to cast everything to string but it would be much better if we didn't have to.

This seems to be a change for python 3. We should probably update our Config class in LmCommon.common.config to be a direct subclass of ConfigParser and to override the set method to ensure all values are strings. It may also be beneficial to create our own base config class with the updated set method and have a default ServerConfig class that adds the default configuration files that are used by our current Config class.