Currently the file_path sections, of the ini_setting.rb's and
openstackconfig.rb's, are not being passed in the best way. When trying
to use ini_settings it throws an error stating "ini_settings only
support collecting instances when a file path is hard coded". Passing
the variables with the 'self.' alleviates this.
This is needed in order to be able to use the purge_config option.
*Added backwards compatability for older versions of inifile
Change-Id: I9b09bf574208af5c044508129e41ec7420ac1f82
39698c4d62