Revert^2 "Introducing vm_tethering_service as system_server_service"

This reverts commit 3833f2f9d62c69cbc95053703b769c515d970b94.

Reason for revert: Relanding the change

Change-Id: I0089cb05124f20f9bb735aa99f753c8bc658dde7
diff --git a/private/service.te b/private/service.te
index 1fb4d1d..6c55ed4 100644
--- a/private/service.te
+++ b/private/service.te
@@ -31,7 +31,8 @@
     type virtualization_maintenance_service, service_manager_type;
 ')
 is_flag_enabled(RELEASE_AVF_ENABLE_NETWORK, `
-    type vmnic_service, service_manager_type;
+    type vm_tethering_service, system_server_service, service_manager_type;
+    type vmnic_service,        service_manager_type;
 ')
 
 type uce_service,                   service_manager_type;