Always run Grow_continue() for started array.

Always run Grow_continue() for started array.

So far there were 2 reshape continuation cases:
 1. array is started /e.g. reshape was already invoked during initrd
                      start-up stage using "--freeze-reshape" option/
 2. array is not started yet /"normal" assembling array under reshape case/

This patch narrows continuation cases in to single one. To do this
array should be started /set readonly in to array_state/ before calling
Grow_continue() function.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>