samba: fix startup with no network

this fixes multiple issues:
- no need to wait for network in initscript
- smbd can correctly bind on 0.0.0.0:445 instead of ::445
- iface ifconf is fine on target. nmbd waits and should bind on every new interface
xbmc: respect $WAIT_NETWORK_TIME while waiting on network

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv into openelec-systemd

Conflicts:
	packages/network/samba/scripts/52_samba