Bug 838096 - Part 1: Rename getPNN as readPNN. r=allstars.chh
Bug 838096 - Part 2: Refactor readPNN. r=allstars.chh
Bug 838096 - Part 3: Ignore the record of EF_PNN if the contents are unused bytes. r=allstars.chh
Bug 838096 - Part 4: xpcshell tests for readPNN. r=allstars.chh
Bug 838096 - Part 5: Modify test_update_network_name. r=allstars.chh