Fix OPENDJ-525: Remove compiler warnings when building using JDK7

Matthew Swift

19.26.2012 861c4b510223ddfeb68deabd5c4a0d309990a32c

 opendj-sdk/opends/src/server/org/opends/server/extensions/FileSystemEntryCache.java

@@ -781,7 +781,8 @@
          entriesExamined++;
          if ((entriesExamined % 1000) == 0) {
            cacheWriteLock.unlock();
            Thread.currentThread().yield();
            Thread.currentThread();
            Thread.yield();
            cacheWriteLock.lock();
          }
        }
@@ -883,7 +884,8 @@
        entriesExamined++;
        if ((entriesExamined % 1000) == 0) {
          cacheWriteLock.unlock();
          Thread.currentThread().yield();
          Thread.currentThread();
          Thread.yield();
          cacheWriteLock.lock();
        }
      } catch (Exception e) {