DO NOT MERGE: Add a stub class for IpSecService.

This is similar to the existing NsdService stub, and it is
required to ensure ConnectivityServiceInitializer builds in
sc-mainline-prod when IpSecService moves to the module.

Also, simplify the existing stub by doing "extends Binder"
instead of "implements IBinder" and adding empty methods that
implement the IBinder interface.

Test: m service-connectivity
Test: cherry-pick aosp/1961307 and m com.android.tethering
Ignore-AOSP-First: needed in sc-mainline-prod only
Change-Id: I151155d4d70dd0c2190aa40c32c97b8c1b8cd691
2 files changed