Create base class that sets up test network

This class will be extended by both IkeSessionParamsTest and
IkeSessionTestBase

Bug: 148689509
Test: atest CtsIkeTestCases
Change-Id: I98979758a7a684219e35c02ded93224ea172d44f
Merged-In: I98979758a7a684219e35c02ded93224ea172d44f
(cherry picked from commit 17a15a451f88acabfcac0f222e67b52db89ccea5)
1 file changed