[ISSUE #94] Batch push compatible with single push

[Git-Yang]

#94

Optimization logic
According to the configuration enableBatchPush, choose whether to synchronize data through batch. When a push request is received, it is judged whether it is a batch push according to the number of messages sent.

[Git-Yang]

Verification Test

Test one：enableBatchPush（false --> true）

• Initialization: The cluster has not yet started BatchPush
• Upgrade content: enable enableBatchPush
  • Unoptimized version test: enableBatchPush=true, upgrade a slave (machine 05)
    
  • Optimized version test: enableBatchPush=true, upgrade a slave (machine machine)
    

Test two：enableBatchPush（true --> false）

• Initialization: Start BatchPush in the cluster
• Upgrade content: turn off enableBatchPush
  • Unoptimized version test: enableBatchPush=false, upgrade a slave (machine 05)
    
  • Optimized version test: enableBatchPush=false, upgrade a slave (machine machine)