Change adb auto-connect to use mdns instance name.

This change will fix reconnects when the ip address and port changes for
the same mdns instance name.

Bug: 152886765

Test: 'adb pair <mdns_instance>' and wait for auto-connect.
'adb devices' | grep <mdns_instance
On device, toggle wireless debugging off/on. Client should be able to
reconnect with the different port.

Change-Id: I9ad486534019ee70fb54c9f26ce028951eca8566