v3.6.14
add existing http health check handler e2e test
tests: Change max retries when removing a member from a cluster
migrate experimental-enable-lease-checkpoint and experimental-enable-lease-checkpoint-persist flag to feature gate.
clientv3: support serializable MemberList operation
fix: enable go-require rule from testifylint
test: refactor the struct to make it clearer
*: enable goimports in verify-lint