pxe persistent bug fix

Sometimes if host is changed to boot from disk, we are not
fixing the pxe flag as persistent options are being ignored.

Fixes: #340
Change-Id: I775537f306136f6a8be8ae7459e0705d1bfc23e7

quads/tools/move_and_rebuild_hosts.py

@@ -290,9 +290,7 @@ async def move_and_rebuild(host, new_cloud, semaphore, rebuild=False, loop=None)
                     "chassis",
                     "bootdev",
                     "pxe",
-                    "options",
-                    "=",
-                    "persistent",
+                    "options=persistent",
                 ]
                 await execute_ipmi(
                     host, arguments=ipmi_pxe_persistent, semaphore=new_semaphore