Bluetooth: Support  HFP Client role on Bluedroid.

Implementation changes to support HFP Client role
on Bluedroid stack

Change-Id: Ie37e95d3b0e3f785af818fb495c835e420792f4d
(cherry picked from commit 072fad9a9a17c2a31660e7ac6cd6eba82d63fe50)
(cherry picked from commit 559508238c2fe1f8f10049549b8a29053399407c)
server: add enhanced routing support

Add support for policy and metric based routing APIs to
NetworkManagementService. This functionality is used for WQE, IMS, and
Android QoS features.

Change-Id: I5e50185c9ac1cf72c9366815c2ecf590842edfca
frameworks/base: IPV6 tethering support

This patch adds two new API calls addUpstreamV6Interface and
removeUpstreamV6Interface to the tethering framework to pass the IPv6
upstream and downstream interfaces to netd if IPv6 is available.
Required to enable ICMPv6 forwarding.

Change-Id: I1f4f6284b2f152d8b4f0fbd02ac5a17f57c71dd7