Tests basic functionality of UDP encap sockets:
> Creates SPIs
> Creates & applies transforms
> Creates UDP encap socket
> Ensures UDP encap socket port is non-zero
> Validates that ESP, IKE packets can be sent correctly
Test: Ran on aosp_angler-eng
Bug: 67662580
Change-Id: Ia7eca384cd779e663d53cbede97ec70da33d28ec