Disable field mode keyword

To give user a way to disable the field mode on demand.

A test_xit.robot is added to ensure when fully loaded CT
is run, this test code is executed at the end. The reason
being they are executed sequentially and _xit is the last
in the order. This is not a very good way to do it but until
we find a better solution, this is pretty much needed.

Change-Id: I351fa513fc6287c966266c46132b9e2ac08a8857
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/extended/code_update/test_field_mode.robot b/extended/code_update/test_field_mode.robot
index 044b124..91b5cd9 100644
--- a/extended/code_update/test_field_mode.robot
+++ b/extended/code_update/test_field_mode.robot
@@ -68,7 +68,4 @@
     # 1. Disable field mode
     # 2. Check that /usr/local is mounted
 
-    BMC Execute Command  /sbin/fw_setenv fieldmode
-    BMC Execute Command  /bin/systemctl unmask usr-local.mount
-    OBMC Reboot (off)  quiet=${1}
-    BMC Execute Command  [ -d "/usr/local/share" ]
+    Disable Field Mode And Verify Unmount