Add additional fields to VpnProfile for profile-based IKEv2/IPsec VPNs

This commit adds the fields required to support IKEv2/IPsec VPNs. Other
fields will be reused where possible.

Bug: 143221465
Test: Compiles, new tests written for parcel/unparcel, encode/decode
Change-Id: I4c0e8fb934e75548424a15bbfb35c2ea9a3a57bc
2 files changed