keep del when del-set produced

[inspurSDN]

what I did:
when del-set-sequence exist in consumer table, I keep the del event been execute even a set of the same key is already seen after the del. why I did: in the old code, the del is setting an key without fv, so if a set with fv after, it will only execute a set, so the multimap m_toSync can not seen the del event, sometimes the lost del may result errors if something is depending on the del event.

[inspurSDN]

always failed for something different vstest cases, all not involved what I do, it is such a bad experience.