Revert "MB-9521: Flusher must retry vbucket if no snapshot"

This reverts commit f864ba7a68fe09731ab6a4f856bfdf627bfde0d3.

Change-Id: I8c6e554e1225318304dc49e6d0fa5ec8d0d633c4
Reviewed-on: http://review.couchbase.org/30397
Reviewed-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>
Tested-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>