Fix robot directive Keywords missing header

Change-Id: I82daedaa509cd811f25eb9366a597ec33450896c
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/bmc_network_security_utils.robot b/lib/bmc_network_security_utils.robot
index 060fbe5..fe3bc37 100644
--- a/lib/bmc_network_security_utils.robot
+++ b/lib/bmc_network_security_utils.robot
@@ -1,10 +1,11 @@
 *** Settings ***
-
 Documentation  Network security utility file.
 
 Resource                ../lib/resource.robot
 Resource                ../lib/bmc_redfish_resource.robot
 
+*** Keywords ***
+
 Send Network Packets And Get Packet Loss
     [Documentation]  Send TCP, UDP or ICMP packets to any network device and return packet loss.
     [Arguments]  ${host}  ${num}=${count}  ${packet_type}=${ICMP_PACKETS}