Remove code for flapmappings file compatibility
Remove code for flapmappings file compatibility

An older format of the flagmappings file required to handle options that
moved from a section to another. This older format is no longer used
and might genereate incorrect default values for new options in groups
other than DEFAULT. Remove the code to avoid this problem.

Change-Id: Iacd55a278f33c05cc6dffbbfedc2ceffedd6ad05

savinash47/openstack-doc-tools,openstack/openstack-doc-tools,savinash47/openstack-doc-tools,openstack/openstack-doc-tools,savinash47/openstack-doc-tools