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rebuildTermSearchKey should wait for slaves.

Authored by daniel.

Description

rebuildTermSearchKey should wait for slaves.

rebuildTermSearchKey should sleep if slaves get lagged, in order
to avoid locking the database because slaves get too far behind.

Change-Id: I9eb2735b688f80e7319c2b73c56cbf6c1ba54fcc
Note: This should be backported to the wmf12 branch.