Add mobile: methods on Android: toggleData, toggleFlightMode, toggleWiFi, toggleLocationServices

Original commit message: didLaunch flag is set at the end of launch sequence

"Ping" ADB to check whether we're still connected

On Android Emulator, ADB is disconnected when we toggle Airplane Mode
or mobile Data. However, the problem does not manifest itself when
querying the list of devices via adb devices: the emulator is still
listed. After attempting to ping the emulator via a shell command, the
emulator is no longer listed and a kill-server is necessary to get ADB
back up and running

Partial recovery from a loss of ADB connection caused by turning off the data connection in the emulator

Conditionnally restart UI Automator in case of unexpected exit, mainly to address the use case of disconnecting the netwok on Android Emulator, which triggers a loss of ADB connection, and subsequently UI Automator connection

New method mobile: toggleData on Android

toggleData method on iOS

toggleFlightMode method

Make toggleData and toggleFlightMode mobile methods available for Selendroid

Fix indentation

Make sure we recover from ADB connection loss on Selendroid when disabling data on emulator

On Android emulator the ADB connection is lost when we disable the data
connection. On Android the ADB connection loss is handled by the UI
Automator exit handler, on Selendroid it must be handled in the toggle
method

Fixed indentation

Fixed ping method

Do not look for exact match in stdout

Reset uiautomatorRestartOnExit flag after we've disabled data connection

Refactor UI Automator exit handler and add a flag to completely ignore UI Automator exit

When we disconnect the network (via either disabling 3G or enabling
Flight Mode), the official Android emulator loses the ADB connection.
However, sometimes the UI Automator exit handler is not called until
the next attempt to send an ADB command. So we introduce a flag to tell
the UI automator exit handler to do nothing, i.e. neither restart UI
Automator nor uninstall the app, we take care of ADB and UI automator
reconnection before sending the next ADB command

Refactor toggleSetting code and handle ADB reconnection

Refactored the toggleSetting code in order to separate the code common
to both Android subplatforms, and code specific to either platforms
(UIAutomator and Selendroid)
Made sure UI Automator restart is handled in the toggleSetting code and
not in the UI Automator exit handler

Selendroid method for handling ADB disconnection in Emulator when turning network connection off

Right keyevent combination to position the focus on Airplane Mode checkbox for API <= 15

On Android 4.1+ (API 16+) there's a "Parent" button in the
AIRPLANE_MODE_SETTINGS Activity's ActionBar, whereas on earlier
versions there's no "Parent" button, so we need to take this into
account when performing the key sequence to position the focus on the
Airplane Mode checkbox

Generic mechanism to let each "toggle" method provide the sequence of key to position the focus

Each "toggle" mobile method may require a different sequence of keys in
order to position the focus within the corresponding Settings Activity.
Now this sequence is dynamically provided by each "toggle" method

mobile: toggleWiFi implementation

Remove blank line

mobile: toggleLocationServices implementation

When toggling LocationServices ON there's a dialog asking for user
confirmation, so we introduce a mechanism that lokks for this dialog
and acknowledge it, but if the dialog doesn't show up we proceed to
exit the settings activity

Adapt key sequence for toggleLocationServices on Android API 16

Fix bug on Kitkat when re-enabling Location Services

On Kitkat when re-entering the Location Services Activity after
disabling it, no UI element has the focus and no key press can let the
target switch grab the focus. The workaround is to make sure an element
has the focus by issuing a key press prior to opening the Location
Services activity.

Fix lint error (mixed tabs and spaces)

Fix lint error (mixed tabs and spaces)

Add comments

Spaces after if

Move variable definition

Shorten variable names

Remove dead code

Move restartAdb method to ADB (and rename to restart)

Rename rr variable to err

Android Test app for "mobile: toggle…" methods

Test script for "mobile: toggle…" methods

Refactoring of toggle test script to avoid code duplication

Adding other toggle methods

Fix lint warning

Handle an unexpected exit of logcat (for instance if ADB itself exits unexpectedly)

Make sure we can restart logcat after stoping it

Stop and restart logcat when restarting ADB

Fix UiAutomator state variable to prevent blocking when restarting UiAutomator