Add "Turn WiFi off" action to "Open networks" notification

Forward ported to kitkat

Squashed:
add "Turn Wi-Fi off" action to the "open networks available" notification
add missing xhdpi turn wifi off image
WiFi open network notification: fix potential crash

Change-Id: I416a129388074c616892f6266af7005b4da1a521
Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>

Conflicts:
	core/res/res/values/strings_custom.xml
	core/res/res/values/symbols_custom.xml
Add "Turn Tethering off" action to WiFi and USB tethering notifications

Change-Id: Ibfbc1fbd8f147b46a7a079511f93227b0687bd3e
Signed-off-by: sethyx <sethyx@gmail.com>

Conflicts:
	core/res/res/values/strings_custom.xml
	core/res/res/values/symbols_custom.xml