Cache preferences and services in status dialog.

Currently, the status dialog fetches the preferences and system
services that it uses to display connectivity information (e.g.,
IP and MAC addresses) only when the dialog is first opened. This
is fine because the connectivity information is only filled in
once and never updated.

In order to have this information update dynamically (like the
rest of the dialog), fetch and cache these objects in onCreate.
The next change will actually make this information update on
network changes.

[Cherry-pick of 6eb6a908217e080aea43406028be491d269bdbb0]

Bug: 10232006
Change-Id: Ib4072674543e517cf6935e3e03f35090e728090a
Dynamically update connectivity and IP address.

The settings status page dynamically updates mobile network
status (in/out of service, signal strength, network type, etc.)
but not IP address and connectivity information. Dynamically
update that information as well, for consistency.

For consistency, also update the advanced wifi settings page.

[Cherry-pick of deb8f08ace7e255939d793c8a5a0006d424734bc]

Bug: 10232006
Change-Id: I3a292d8bd9e36ab16c37e107eefff4b37d884a4c
Wrong referring to the resource - id/android:id

We were referring to the resource defined as
@+android:id with R.id. which is wrong. This
fix changes the @+android:id/ to @+id/

Change-Id: Ifdca7347bff31311c9c07aecdb110946e4a239ed
Fix switching running/cached apps with memory bar

Fixes issue #38735.

Invalidate the owner fragment options menu when changing mode from within
RunningProcessesView.

Change-Id: I85af7a953a1f4f570902f0959ee284f208871bce
Use java.util.Objects instead of internal API

Change-Id: Ib0d797b3e7f2e4f831f52832776b64c0973880b3
Fix elapsed time formatting.

We should extend DateUtils to provide this kind of elapsed time
formatting via icu4c, but for now let's at least fix our
arithmetic.

Bug: https://code.google.com/p/android/issues/detail?id=61479
Change-Id: I6c087dbb9fdbff0a21d9243d239126fee180454c
Dont show "Erase SD Card" when there is none

On devices with physcal, external SD Cards, the "Erase SD card"
option in in Settings/Storage is available even when there is
no SD card present, this dont make much sense since you cannot
erase a card that is absent. With this change the erase option
is bound to the mount toggle which leads to the following
consequences:

 Card present and mounted -> Erase enabled
 Card present but unmounted -> Erase enabled
 No card present -> Erase disabled
 Card present and MTP attached -> Erase disabled

Change-Id: I756ae8af3e0565febaf940df5f4991dd89105bd9
Fix null pointer exceptions in NetworkPolicyEditor

This upload fixes a null pointer exception issue.
After this fix the modified methods return
their corresponding default values instead of null.

Change-Id: Idb94f8b808b8dd18be5e3fc92cc5560ce0f81c4f