New issue 220 by ius...@google.com: Missing --submit for the add/remove
tags operations
http://code.google.com/p/ganeti/issues/detail?id=220
for kind in instance node ; do for op in add remove; do gnt-$kind $op-tags
--help; done; done|grep submit
<empty output>
gnt-instance migrate has no "--submit" too, and many other non-interactive
commands of gnt-instance lack this option.