Imporve monitor_process pass criteria

Imporve monitor_process pass criteria

JIRA: YARDSTICK-660

The monitor func()'s criteria in the monitor_process.py now is whether at least
one process of the specific controller node service is recovered. But in reality
is more resonable to use whether processes have been recoverd to it's original
amount. This patch is aiming at improving the isssue

Change-Id: I950ce2a89555801b96092735b0d670e892049927
Signed-off-by: JingLu5 <lvjing5@huawei.com>
(cherry picked from commit 37921fcd232cd2fbba9f45ef9fa5d8c912f54af6)