Update activity-lifecycle sample: Use unique package name

Changing the package name for activity-lifecycle sample from
com.example.android to com.example.android.lifecycle.

Change-Id: I8c17762fde0895408da0b2e1b17b425bcb9e7abb

samples/training/basic/activity-lifecycle/AndroidManifest.xml

@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-      package="com.example.android"
+      package="com.example.android.lifecycle"
       android:versionCode="1"
       android:versionName="1.0">
 
@@ -23,7 +23,7 @@ limitations under the License.
     <application android:label="@string/app_name"
                  android:icon="@drawable/ic_launcher">
 
-        <activity android:name=".lifecycle.ActivityA"
+        <activity android:name=".ActivityA"
             android:launchMode="singleTask">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -31,11 +31,11 @@ limitations under the License.
             </intent-filter>
         </activity>
 
-        <activity android:name=".lifecycle.ActivityB" />
+        <activity android:name=".ActivityB" />
 
-        <activity android:name=".lifecycle.ActivityC" />
+        <activity android:name=".ActivityC" />
 
-        <activity android:name=".lifecycle.DialogActivity"
+        <activity android:name=".DialogActivity"
                   android:theme="@android:style/Theme.Dialog">
         </activity>
 

samples/training/basic/activity-lifecycle/src/com/example/android/lifecycle/ActivityA.java

@@ -22,7 +22,6 @@ import android.os.Bundle;
 import android.view.View;
 import android.widget.TextView;
 
-import com.example.android.R;
 import com.example.android.lifecycle.util.StatusTracker;
 import com.example.android.lifecycle.util.Utils;
 

samples/training/basic/activity-lifecycle/src/com/example/android/lifecycle/ActivityB.java

@@ -22,7 +22,6 @@ import android.os.Bundle;
 import android.view.View;
 import android.widget.TextView;
 
-import com.example.android.R;
 import com.example.android.lifecycle.util.StatusTracker;
 import com.example.android.lifecycle.util.Utils;
 

samples/training/basic/activity-lifecycle/src/com/example/android/lifecycle/ActivityC.java

@@ -22,7 +22,6 @@ import android.os.Bundle;
 import android.view.View;
 import android.widget.TextView;
 
-import com.example.android.R;
 import com.example.android.lifecycle.util.StatusTracker;
 import com.example.android.lifecycle.util.Utils;
 

samples/training/basic/activity-lifecycle/src/com/example/android/lifecycle/DialogActivity.java

@@ -20,7 +20,6 @@ import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.Window;
-import com.example.android.R;
 
 public class DialogActivity extends Activity {
     @Override