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Change memcached icinga alert from anomaly to threshold

Authored by bd808.

Description

Change memcached icinga alert from anomaly to threshold

The Holt-Winters predictive model alert did not fire during a failure of
a nutcracker instance that drove the error rate up to a peak of 35K/min
from a nominal baseline of 100-150/min. Change to a more straight
forward threshold check with a warning level of 10x baseline and
a critical level of 50x baseline.

Bug: T69817
Change-Id: I98a4647019716bab47b93de3d575dd4bcb8404ba