Merge pull request #16080 from jaoo/968092

Bug 968092 - APN Settings: parse apn type 'dun' and 'ims' from apn.json. r=kaze
Bug 969298 - [Gaia] Need to add setting menus for 'dun' and 'ims' apn types
Bug 969298 - [Gaia] Need to add setting menus for 'dun' and 'ims' apn types
Bug 969298 - [Gaia] Need to add setting menus for 'dun' and 'ims' apn types
Bug 969298 - [Gaia] Need to add setting menus for 'dun' and 'ims' apn types