netipmid: use boost::asio signal handling

boost::asio provides a signal handling interface that looks familiar to
the rest of its async API. This will allow the event loop to cleanly
shut down upon receipt of SIGTERM or SIGINT.

Change-Id: I6a888a0bb0206e885da9e0fcf4856b96ec93a461
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
1 file changed