Finally make DbusIpcThread terminate

...by directly calling shutdown(3) on the underlying socket, to make
dbus_connection_read_write fall out of its internal poll(3) call blocked on
POLLIN (upon which it returns false).  (dbus_connection_close only calls
close(3), so calling it from DbusIpcThread::close would merely decrement the
socket file descriptor's reference count.)  This removes the need for the sent-
to-self "Close" command (whose processing turned out to be too brittle in
parallel with closing the connection down, witness my previous three fruitless
commits in this area).

There appears to be no need to explicitly call dbus_bus_release_name, as the
session bus apparently takes care of releasing the name as soon as the
associated connection is closed.

Also there should be no need to call dbus_connection_read_write_dispatch instead
of just dbus_connection_read_write, and dbus_message_pop_message should probably
be called in a loop, until all queued messages are processed.

Change-Id: I13f30b6676a531f349e953329e910c1ff45ee53e

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