setKeyspace defuncts connections on operation timeout

[dkropachev]

Problem

Connection.setKeyspace handles ConnectionException before OperationTimedOutException:

java-driver/driver-core/src/main/java/com/datastax/driver/core/Connection.java

Lines 888 to 903 in 46993c7

	} catch (ExecutionException e) {
	Throwable cause = e.getCause();
	if (cause instanceof BusyConnectionException) {
	throw keyspaceBusyException();
	} else if (cause instanceof QueryValidationException) {
	throw (QueryValidationException) cause;
	} else if (cause instanceof ConnectionException) {
	throw defunct((ConnectionException) cause);
	} else if (cause instanceof OperationTimedOutException) {
	// Rethrow so that the caller doesn't try to use the connection, but do not defunct as we
	// don't want to mark down
	logger.warn(
	"Timeout while setting keyspace on {}. "
	+ "This should not happen but is not critical (it will be retried)",
	this);
	throw new ConnectionException(endPoint, "Timeout while setting keyspace on connection");

OperationTimedOutException extends ConnectionException:

java-driver/driver-core/src/main/java/com/datastax/driver/core/exceptions/OperationTimedOutException.java

Line 31 in 46993c7

public class OperationTimedOutException extends ConnectionException {

The timeout branch is unreachable. A transient keyspace setup timeout defuncts the connection and signals host conviction, contrary to the intended handling.

Fix

Check OperationTimedOutException before generic ConnectionException. Add synchronous setKeyspace coverage asserting the connection remains usable.

Regression from #942.