redisdb: add replication service check and 'down since' metric#1329

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pbitty wants to merge 2 commits intoDataDog:masterfrom Wattpad:redis_replication_service_check

+83

Commits on Jan 30, 2015

redisdb: add replication service check and master_link_down_since_seconds metric
pbitty
committed

Commits on Feb 2, 2015

redisdb: add time.sleep in the tests so replication failure metrics can build up
pbitty
committed