Improved the judgment of the service status(up or down) in memcache

Registered by gengchc2

Improved the judgment of the service status(up or down) in memcache. In servicegroup/drivers/mc.py,
if the key(topic:host) is existed in memcache,service status is judged as up.This judgment is not reasonableit.It is more reasonable that the service status should be based on the CONF.service_down_time :if the period of the service status reported is more than CONF.service_down_time, can be considered as down.

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Drafter:
gengchc2
Direction:
Needs approval
Assignee:
gengchc2
Definition:
New
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None
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Unknown
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Gerrit topic: https://review.openstack.org/#q,topic:bp/improved-the-judgment-of-the-service-status-in-memcache,n,z

Addressed by: https://review.openstack.org/423754
    Improved-the-judgment-of-the-service-status-in-memcache

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