base

Fix socket descriptor leak from Zygote to child app

Due to an API change in LocalSocket, Zygote must now
manually close the FileDescriptor it created when it
registered a LocalServerSocket.  The LocalSocket.close()
routine will no longer do so.

Bug: 12114500
Change-Id: I8c9fb073924ac33d594bd3bd0eb11d3d1d402506