Add a mechanism to pass the L2Key and group hint to IpClient

Test: IpClientTest
Bug: 128803828
Change-Id: I399b20ce29a385a74971b7a7248a48cb4d66deb6
(cherry picked from commit 3cab290648a0a0f6e5f6c64c2225b3661aabba2f)
3 files changed