Merge pull request #6873 from crh0716/818829

Bug 818829 - [Settings] The password field shoud be grayed-out/hidden is WiFi is shared with level security open r=evelynhung(cherry picked from commit 22f5874ffefdcfcfeb6217ed0be83da80352858e)
Merge pull request #8658 from mikeaich/bug850629

Bug 850629 - set date/time field in EXIF header, and save screenshots with local-time-based filenames r=djf(cherry picked from commit 8e0bf5115a75891bdfebfc980e52241780563fa9)