Omnia: Make sure sfp switch brings the NIC down

The sfpswitch daemon has to bring the NIC down for sure before
calling network restart.

Add safety timeout to be sure the network down/up happens after
the switch is comitted to the kernel.

sfpswitch/sfpswitch.py

@@ -3,6 +3,7 @@
 import sys
 import os
 import select
+import time
 
 sfpdet_pin = 508
 sfpdis_pin = 505
@@ -10,7 +11,8 @@ sfpdis_pin = 505
 gpio_export = '/sys/class/gpio/export'
 sfp_select = '/sys/devices/platform/soc/soc:internal-regs/f1034000.ethernet/net/eth1/phy_select'
 map = { 1: 'phy-def', 0: 'phy-sfp' }
-cmd_net_res = '/etc/init.d/network restart'
+cmd_net_res = 'ip link set down dev eth1; /etc/init.d/network restart'
+cmd_safety_sleep = 2
 
 def write_once(path, value):
 	with open(path, 'w') as f:
@@ -47,6 +49,7 @@ def do_switch(state, restart_net=True):
 	print 'Switching state to %s' % map[state]
 	write_once(sfp_select, map[state])
 	if restart_net:
+		time.sleep(cmd_safety_sleep)
 		os.system(cmd_net_res)