bluetooth: Rename DUN GW plugin

As BlueZ 5 introduced backwards incompatible API changes, and we want to keep support for BlueZ 4 based DUN GW plugin for some time, we need to separate DUN GW plugin which is based on BlueZ 4 from the one based on BlueZ 5.

The dun_gw.c plugin is renamed to dun_gw_bluez4. This will make it easy to add a DUN GW plugin for BlueZ 5.

---
  Makefile.am                           |    4 ++--
  plugins/{dun_gw.c =>  dun_gw_bluez4.c} |    5 +++--
  2 files changed, 5 insertions(+), 4 deletions(-)

rename plugins/{dun_gw.c => dun_gw_bluez4.c} (96%)

This patch adds initial implementation of the D-Bus Profile1 interface and methods responsible for handling Bluetooth connections.

The DUN GW profile interface is registered as soon as a GPRS capable modem is registered in oFono.

---
  Makefile.am             |    3 +
  plugins/bluez5.h        |    1 +
  plugins/dun_gw_bluez5.c |  235 +++++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 239 insertions(+)

create mode 100644 plugins/dun_gw_bluez5.c

plugins/dun_gw_bluez5.c new file +24 -0

+static DBusMessage *profile_new_connection(DBusConnection *conn,
+						DBusMessage *msg, void *data)
+{
+	DBusMessageIter entry;
+	const char *device;
+	int fd;
+	struct ofono_emulator *em;
+	struct ofono_modem *modem;
+
+	DBG("Profile handler NewConnection");
+
+	if (dbus_message_iter_init(msg,&entry) == FALSE)
+		goto invalid;
+
+	if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_OBJECT_PATH)
+		goto invalid;
+
+	dbus_message_iter_get_basic(&entry,&device);
+	dbus_message_iter_next(&entry);
+
+	if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_UNIX_FD)
+		goto invalid;
+
+	dbus_message_iter_get_basic(&entry,&fd);

plugins/dun_gw_bluez5.c new file +11 -0

+	}
+
+	DBG("Picked modem %p for emulator", modem);
+
+	em = ofono_emulator_create(modem, OFONO_EMULATOR_TYPE_DUN);
+	if (em == NULL) {
+		close(fd);
+		return g_dbus_create_error(msg, BLUEZ_ERROR_INTERFACE
+						".Rejected",
+						"Not enough resources");
+	}