Update skip list with tag "Test_BMC_Alt_Side_Mirroring"

Change-Id: I21131d84258e623719f010a3e80f166049d048a8
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/test_lists/witherspoon/skip_test_witherspoon_GA1 b/test_lists/witherspoon/skip_test_witherspoon_GA1
index 5509aa4..1033613 100755
--- a/test_lists/witherspoon/skip_test_witherspoon_GA1
+++ b/test_lists/witherspoon/skip_test_witherspoon_GA1
@@ -47,3 +47,4 @@
 -e Verify_Core_Dump_Size
 -e REST_Upload_Stability_Test
 -e Verify_REST_Bad_Request_Post_Message_JSON_Compliant
+-e Test_BMC_Alt_Side_Mirroring