Hostname verification fix.

Resolves openbmc/openbmc-test-automation#1690

Signed-off-by: Prashanth Katti <prkatti1@in.ibm.com>
Change-Id: I540d4808f61f40d30b60391fa485e2701b7c9d73
diff --git a/lib/bmc_network_utils.robot b/lib/bmc_network_utils.robot
index c37763c..5b29e1e 100644
--- a/lib/bmc_network_utils.robot
+++ b/lib/bmc_network_utils.robot
@@ -132,17 +132,10 @@
 Get BMC Hostname
     [Documentation]  Get BMC hostname.
 
-    # Sample output of  "hostnamectl":
-    #   Static hostname: xxyyxxyyxx
-    #         Icon name: computer
-    #        Machine ID: 6939927dc0db409ea09289d5b56eef08
-    #           Boot ID: bb806955fd904d47b6aa4bc7c34df482
-    #  Operating System: Phosphor OpenBMC (xxx xx xx) v1.xx.x-xx
-    #            Kernel: Linux 4.10.17-d6ae40dc4c4dff3265cc254d404ed6b03fcc2206
-    #      Architecture: arm
+    # Sample output of  "hostname":
+    # test_hostname
 
-    ${output}  ${stderr}  ${rc}=  BMC Execute Command
-    ...  hostnamectl | grep hostname | cut -f 2 -d : | sed -re 's/ //g'
+    ${output}  ${stderr}  ${rc}=  BMC Execute Command  hostname
 
     [Return]  ${output}