Code cleanup for sensor test suite

Changes:
      - Remove "Open Connection And Log In" initialization.
      - Add OPENBMC_MODEL variable in resource.txt file.

Change-Id: I63afc9a1de04f38de325abc086ae140749b14491
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/resource.txt b/lib/resource.txt
index 57d1353..48ab60e 100755
--- a/lib/resource.txt
+++ b/lib/resource.txt
@@ -6,6 +6,8 @@
 Variables         ../data/variables.py
 
 *** Variables ***
+
+${OPENBMC_MODEL}  ${EMPTY}
 ${OPENBMC_HOST}   ${EMPTY}
 ${DBUS_PREFIX}    ${EMPTY}
 ${PORT}           ${EMPTY}
diff --git a/tests/test_sensors.robot b/tests/test_sensors.robot
index fadf4ce..5db2436 100644
--- a/tests/test_sensors.robot
+++ b/tests/test_sensors.robot
@@ -14,7 +14,6 @@
 Resource               ../lib/utils.robot
 
 Suite Setup            Suite Setup Execution
-Test Setup             Open Connection And Log In
 Test Teardown          Test Teardown Execution
 
 *** Variables ***
@@ -42,7 +41,6 @@
     # Boot Host.
     REST Power On
 
-    Open Connection And Log In
     ${resp}=   Read Properties   ${OPENBMC_BASE_URI}enumerate   timeout=30
     Set Suite Variable      ${SYSTEM_INFO}          ${resp}
     log Dictionary          ${resp}