Consider check the term when update the leader

[nolouch]

Feature Request

Describe your feature request related problem

There are sometimes the PD updates invalid cache information because TiKV reported old heartbeat information, we already consider check the epoch before update the region cache, but the leader changed do not changed the epoch, we need to check the term to prevent the invalid update:

Describe alternatives you've considered

• check the term before updating the region cache to prevent the invalid updates.

Teachability, Documentation, Adoption, Migration Strategy

• Go
• Relative Code: https://github.com/pingcap/pd/blob/master/server/core/basic_cluster.go#L292-L314

[nolouch]

Would you like to try it? @howardlau1999

[howardlau1999]

Would you like to try it? @howardlau1999

Yes, I'll give it a try