Redundance eth0/eth1 network interfaces changes

Changes:
     - Introduce OPENBMC_HOST_ETH0 and OPENBMC_HOST_ETH1
     - Assign OPENBMC_HOST_ETH0 default with OPENBMC_HOST
       and OPENBMC_HOST_ETH1 with EMPTY
     - Modify all the code which involves using both eth0
       and eth1
     - User will need to key in as
            -v OPENBMC_HOST_ETH1:xx.xx.xx.xx
       as oppose to earlier
            -v OPENBMC_HOST_1:xx.xx.xx.xx

Tested:
    - Sanity dry-run robot test with changes from sandbox

Change-Id: Iedeff2cfa252637bcf202979772ee1c5c90066b5
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/resource.robot b/lib/resource.robot
index c12f52a..550774a 100755
--- a/lib/resource.robot
+++ b/lib/resource.robot
@@ -23,6 +23,12 @@
 ${DBUS_PREFIX}             ${EMPTY}
 ${PORT}                    ${EMPTY}
 
+# BMC ethernet eth0 and eth1 for multiple interfaces.
+# By default eth0 is assigned with OPENBMC_HOST
+${OPENBMC_HOST_ETH0}       ${OPENBMC_HOST}
+${OPENBMC_HOST_ETH1}       ${EMPTY}
+
+
 # AUTH_SUFFIX here is derived from variables.py
 ${AUTH_URI}                https://${OPENBMC_HOST}${AUTH_SUFFIX}
 ${OPENBMC_USERNAME}        root