test: wait for Scassandra pool removal after stop

[dkropachev]

Summary

• wait for ScassandraCluster.stop to observe session pool removal after a host is marked down
• close the race where policy tests can issue queries while SessionManager.onDown is still closing the stopped host's pool

Fixes #387

Testing

• git diff --check
• mvn -pl driver-core -Dtest=RackAwareRoundRobinPolicyTest#should_only_use_remote_hosts_when_using_non_dc_local_cl,DCAwareRoundRobinPolicyTest#should_only_use_remote_hosts_when_using_non_dc_local_cl test

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📥 Commits

Reviewing files that changed from the base of the PR and between 9d45182 and cabda50.

📒 Files selected for processing (1)

• driver-core/src/test/java/com/datastax/driver/core/ScassandraCluster.java

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