SERVER-8170: manually free external resources upon V8Scope destruction
SERVER-8632: fix server-side JS for MapReduce, $where and group
SERVER-8710 check balancer is stopped before upgrading
SERVER-8710 better forcing behavior for upgrade and namespace locks during config upgrade process
Revert "SERVER-8710 check balancer is stopped before upgrading"

This reverts commit e57f5d32d93cd23971cadfcdb93a4b9f07a0ef5a.
SERVER-8710 check balancer is stopped before upgrading to nonzero config version
SERVER-8761 ignore non-shard connections in conn pool test