Fix network post reboot login bug

Change-Id: Ib0b5da691c38e2adbbff121cf2b70b792e3243a3
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/managers/test_bmc_network_conf.robot b/redfish/managers/test_bmc_network_conf.robot
index 0c14ae9..b03ae56 100644
--- a/redfish/managers/test_bmc_network_conf.robot
+++ b/redfish/managers/test_bmc_network_conf.robot
@@ -169,6 +169,7 @@
 
     # Reboot BMC and verify persistency.
     OBMC Reboot (off)
+    Redfish.Login
     Verify IP On BMC  ${test_ipv4_addr}
     Delete IP Address  ${test_ipv4_addr}