Rename NetworkStack package

Set the new name to com.android.networkstack. Also rename the stub APK
to com.android.networkstack.permissionstub.

Also add shared UID to the NetworkStackPermissionStub to enforce
signature restrictions on the UID.

Test: booted, WiFi working
Bug: 124033493
Change-Id: Id8967db08b7faaa659b20f86f1013493eb0e188f

data/etc/privapp-permissions-platform.xml

@@ -199,7 +199,7 @@ applications that come with the platform
         <permission name="android.permission.USE_RESERVED_DISK"/>
     </privapp-permissions>
 
-    <privapp-permissions package="com.android.mainline.networkstack">
+    <privapp-permissions package="com.android.networkstack">
         <permission name="android.permission.ACCESS_NETWORK_CONDITIONS"/>
         <permission name="android.permission.CHANGE_BACKGROUND_DATA_SETTING"/>
         <permission name="android.permission.CONNECTIVITY_INTERNAL"/>

packages/NetworkStack/AndroidManifest.xml

@@ -17,7 +17,7 @@
  */
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="com.android.mainline.networkstack"
+          package="com.android.networkstack"
           android:sharedUserId="android.uid.networkstack">
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

packages/NetworkStackPermissionStub/AndroidManifest.xml

@@ -17,7 +17,8 @@
  */
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.android.mainline.networkstack.permissionstub">
+    package="com.android.networkstack.permissionstub"
+    android:sharedUserId="android.uid.networkstack">
     <!--
     This package only exists to define the below permissions, and enforce that they are only
     granted to apps sharing the same signature.