keep del when del-set-sequence exist

[ryan44guo]

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.

[linux-foundation-easycla]

• ❌ - login: @ryan44guo . The commit (5c3b0ad) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.