Merge pull request #15839 from jaoo/964216-followup

Bug 964216 - follow-up: fix getEnv issue r=julien
Merge pull request #15654 from jaoo/962453

Bug 962453 - [DSDS] Once visit APN setting of one SIM, same APN of another SIM will be changed to "Custom". r=arthurcc
Bug 947855 - Automatic selection of APN relying on the IMSI code in the ICC card
Bug 947855 - Automatic selection of APN relying on the IMSI code in the ICC card
Bug 947855 - Automatic selection of APN relying on the IMSI code in the ICC card