[SPARK-13901][CORE] correct the logDebug information when jump to the next locality level

JIRA Issue:https://issues.apache.org/jira/browse/SPARK-13901
In getAllowedLocalityLevel method of TaskSetManager,we get wrong logDebug information when jump to the next locality level.So we should fix it.

Author: trueyao <501663994@qq.com>

Closes #11719 from trueyao/logDebug-localityWait.