LU-11762 ldlm: ensure the recovery timer is armed

LU-11762 ldlm: ensure the recovery timer is armed

During recovery, when the recovery timer is expired, the VBR phase
is initiated only the current recovery timeout is less than the hard
recovery timeout, or it will be stuck in the "wait_event_timeout()"
because there is no timer and it can't be waked up.

Change-Id: I32467afa45393e37f255e2b14f160c9da710461b
Signed-off-by: Hongchao Zhang <hongchao@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/35627
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>