Fix warning and errors CI

Change-Id: I00689763f9128229382a389826336eb5cd99662d
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/secureboot/secureboot.py b/lib/secureboot/secureboot.py
index f38458e..1c3ec3a 100644
--- a/lib/secureboot/secureboot.py
+++ b/lib/secureboot/secureboot.py
@@ -4,9 +4,8 @@
 This module provides some functions for Secure Boot verification.
 """
 
-import bmc_ssh_utils as bsu
-import var_funcs as vf
-from robot.libraries.BuiltIn import BuiltIn
+import bmc_ssh_utils as bsu  # NOQA
+import var_funcs as vf  # NOQA
 
 
 # Define 'constant' functions.