Create TestNetworkUtils for IKE and IPsec CTS

Create TestNetworkUtils that provides interfaces to set up test
network. It will be used by both IKE and IPsec CTS

Bug: 148689509
Test: atest CtsIkeTestCases
Change-Id: I1c49711d3c6ce03ceafdbf3004e25d9d59a6201c
Merged-In: I1c49711d3c6ce03ceafdbf3004e25d9d59a6201c
(cherry picked from commit 91b034d5c649d8b7de1ff6d936f4859f927eb202)
1 file changed
tree: 734e40c486e73b966c5f0c2ff8bd765a10f13a72
  1. tests/