provide local copy of <linux/can/netlink.h> for libnl
Implement Networkmanager

- Enable NetworkManager with WEXT support
- Enable dbus-python for the XBMC addon to work
- Enable dhcpclient
- Keep /etc on NAND as system is kept r/w anyway
- Changes network script to auto connect eth via dhcp (for the moment
till eth0 is implemented in NetworkManager as well)