Add attribution tags for VCN and VPN

Allows IKE library metrics to identify and log the system clients

Bug: 278943609
Test: manually verified the metrics
Test: CtsVcnTestCases, FrameworksVcnTests, Ikev2VpnTest
Change-Id: I4f1ad093ceeb762f4ee72be9bf00445e64d70793
2 files changed