Added redfish.login in obmc_boot_test_resource.robot file

Changes:
	- While running bunch of scripts, sometimes due to session not available power operations keywords are getting failed.
	  Hence added redfish.login in OBMC Boot Test keyword on extended/obmc_boot_test_resource.robot file.

Tested:
     - Ran All The Scripts Successfully

Change-Id: I44b3c8469c8044a0e74aec030057da505b709281
Signed-off-by: ganesanb <ganesanb@ami.com>
diff --git a/extended/obmc_boot_test_resource.robot b/extended/obmc_boot_test_resource.robot
index 063d47d..fa8ac19 100644
--- a/extended/obmc_boot_test_resource.robot
+++ b/extended/obmc_boot_test_resource.robot
@@ -89,6 +89,8 @@
     [Teardown]  OBMC Boot Test Teardown
     [Arguments]  ${pos_arg1}=${EMPTY}  &{arguments}
 
+    Redfish.Login
+
     # Note: If I knew how to specify a keyword teardown in python, I would
     # rename the "OBMC Boot Test Py" python function to "OBMC Boot Test" and
     # do away with this robot keyword.