HW_CI test list: Check system uptime average

This commit extends the hardware CI test bucket by verifying the average
system uptime after a boot is less than an arbitrary threshold. A
threshold of 3 minutes was selected by experimentation - a healthy
system typically had an uptime of around 2.5 minutes.

Change-Id: I6266330ca6b912b4f68787fc141d1945f6b13e16
Signed-off-by: Michael Tritz <mtritz@us.ibm.com>
Signed-off-by: Saqib Khan <khansa@us.ibm.com>
diff --git a/test_lists/HW_CI b/test_lists/HW_CI
index 0334819..3f82025 100644
--- a/test_lists/HW_CI
+++ b/test_lists/HW_CI
@@ -19,5 +19,7 @@
 -i Multiple_Requests_On_BMC_Using_Single_REST_Session
 -i REST_Delete_All_Sessions_And_Expect_Error
 -i REST_Logout_Session_To_BMC
+#Verify system boot time average
+-i Verify_Uptime_Average_Against_Threshold
 # Check for BMC dump.
 -i Verify_No_BMC_Dump