Move network security common keywords to library

Signed-off-by: Prashanth Katti <prkatti1@in.ibm.com>
Change-Id: I0aaf44a420a84d96c1cc2cc08a209e69ba112528
diff --git a/lib/bmc_network_security_utils.robot b/lib/bmc_network_security_utils.robot
index 92d02fb..060fbe5 100644
--- a/lib/bmc_network_security_utils.robot
+++ b/lib/bmc_network_security_utils.robot
@@ -6,7 +6,7 @@
 Resource                ../lib/bmc_redfish_resource.robot
 
 Send Network Packets And Get Packet Loss
-    [Documentation]  Send TCP, UDP or ICMP packets to any network device.
+    [Documentation]  Send TCP, UDP or ICMP packets to any network device and return packet loss.
     [Arguments]  ${host}  ${num}=${count}  ${packet_type}=${ICMP_PACKETS}
     ...          ${port}=80  ${icmp_type}=${ICMP_ECHO_REQUEST}