Fix invalid boot policy test case

The changes includes:
    - Removing known_issue tag as we are no longer using this tag
    - Ignoring "Set Boot Policy" failure. In this case, "Set Boot
      Policy" failure is expected behavior and constitutes a successful
      test
    - Add keyword name tag as per openbmc/openbmc-test-automation#126
    - Update test documentation

Change-Id: Idce9a5ffb76fbc3920b5dc2619d4c0a5d8b4bb76
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/tests/test_bootpolicy.robot b/tests/test_bootpolicy.robot
index 279bc34..4bc4911 100644
--- a/tests/test_bootpolicy.robot
+++ b/tests/test_bootpolicy.robot
@@ -122,12 +122,11 @@
     Should Be Equal    ${flag}    CDROM
 
 Set boot policy to invalid value
-    [Documentation]   This testcase is to verify that proper error message is prompted
-    ...               when invalid value to provided to boot policy.
-    ...               Existing Issue: https://github.com/openbmc/openbmc/issues/552
-    [Tags]  known_issue
+    [Documentation]   This testcase verify that the boot policy doesn't get
+    ...               updated with invalid policy supplied by user.
+    [Tags]  Set_boot_policy_to_invalid_value
 
-    Set Boot Policy   abc
+    Run Keyword and Ignore Error    Set Boot Policy   abc
 
     ${boot} =   Read Attribute  /org/openbmc/settings/host0    boot_policy
     Should Not Be Equal    ${boot}    abc