Automation fix for ifconfig command

changes:
   - ifconfig error message:
     Command 'ifconfig' returned non-zero exit status 127
   - command changed to /sbin/ifconfig

Change-Id: I123c86ba2a444c0286b10aa15cbf1c3b1a2597a5
Signed-off-by: Sushil Singh <susilsi7@in.ibm.com>
diff --git a/lib/bmc_network_utils.py b/lib/bmc_network_utils.py
index b6e2ba0..00a675f 100644
--- a/lib/bmc_network_utils.py
+++ b/lib/bmc_network_utils.py
@@ -25,7 +25,7 @@
     Get the IP address of server from which robot code is running.
     """
 
-    stdout = subprocess.check_output("ifconfig", shell=True)
+    stdout = subprocess.check_output("/sbin/ifconfig", shell=True)
     stdout = stdout.decode("utf-8")
     ip_list = re.findall(ip_regex, stdout)