QS: Add security footer.

Adds a footer with notification of when a device owner is present
and when a VPN is active.

VPN portions still need some work for detecting when/what is
active, disconnecting, and launching the current VPN app.

Bug: 16153201
Bug: 14430719
Change-Id: I546f45895685b0120e03892539041b41430bb981
9 files changed