Add basic tests for IKEv2/IPsec VPNs

This change adds basic tests for all IKEv2/IPsec VPN public APIs.
Additional testing for ensuring IKEv2 setup completes will be done in a
subsequent CL.

Bug: 148582947
Test: Ikev2VpnTest added
Change-Id: Ia5d35c32525b32be4a0dc0584630f5bb9e7f1bcb
Merged-In: Ia5d35c32525b32be4a0dc0584630f5bb9e7f1bcb
(cherry picked from commit 12f571feaea736de875aebef8ad0cc70630ad6ab)
1 file changed