Make DNS cache lifecycle management explicit

1. ConnectivityService calls netd binder to create/destroy network directly.
2. Call dnsresolver binder to create/destroy cache after create/destroy network.
3. Remove unused network create/destroy methods in NetworkManagementService.

Bug: 129453995
Test: atest FrameworksNetTests

Merged-In: I388e208143c38b89bcbb0589de393250024d59aa
(cherry picked from commit 204ca13e63f063f044ac4ad3b96f08b473fe59df)

Change-Id: I4d3dfd9305b60a724aa2dc38448948d8e710c932
5 files changed