healthMonitor: wait until enough sensor reading in queue

Usually the BMC is very busy during startup and it is risky to fill up
the entire queue with only one initial value.

In this patch, we wait until the queue is filled with enough sensor
values before doing any checks.

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I38de9351e88fb666051008170bdeae635fbcd103
1 file changed