[BP MB-34143] - Data miss match for slow handlers in volume test

Build: 6.5.0-3143

Test : volume test 

Steps: 

• Create 1M doc
• Deploy 4 handlers bucket-op,timers,SBM,Curl
• Create 3M doc
• KV rebalance in with 2 nodes
• Create 3M doc
• KV rebalance out 2 nodes
• Create 3M doc
• Swap 2 kv nodes
• Create 3M doc
• Eventing rebalance in with 2 nodes
• Create 3M doc
• Eventing rebalance out with 2 nodes
• Create 3M doc
• Swap 2 eventing nodes
• Create 3M doc
• 1 KV,1 eventing rebalance in 
• Create 3M doc
• 1 KV,1 eventing rebalance out 
• Create 3M doc
• 1 KV,1 eventing swap rebalance

Documents at the end of test, bucket_op is source bucket for all test 

bucket_op - 13,445,000

bucket_op_dst - 13,445,000

timer_op_dst - 13,445,000

curl_op_dst - 12,969,067 (expected  ** 13,445,000)

sbm_dst - 26,889,694  (expected  ** 13,445,000*2=26,890,000)