upnp: use port setting when creating GUPnPContextManager

Bumps dleyna-core dependency to 0.5.

Fixes #141.

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
host-service: use push-host-port setting for the web server

The push-host-port configuration value will be used for the webservers
used to implement the Push Host functionality.

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>