Settings: Fix password shown issue in landscape mode

Fix the bug that the password shown as "........" with "Show password" selected
after rotating phone to landscape mode in Set up Wi-Fi hotspot main view.

Password textview and CheckBox will reset to the default after rotating phone to landscape,
Add one static variable to save CheckBox's selected value.

Change-Id: I33f9f4274c6578ab93999616b1a9853c75046871
Author: Jianchun Shen <jianchunx.shen@intel.com>
Signed-off-by: Jianchun Shen <jianchunx.shen@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 57274
Option "None" replaced "Open" in Wi-Fi AP Settings of Wi-Fi Hotspot

First option in Wi-Fi AP settings of Wi-Fi Hotspot, "Open", is
changed to "None" since "Open" is not localized.
"None" (@string/wifi_security_none) already in use in other
Wi-Fi related screens and it is already localized in
the existing source code.

Change-Id: Ic79b20e3b0f094e064dd4758d8a03d67a208389a