ACCUMULO-2653 Remove unused and unhelpful javadoc tags

  Added @Override annotations and removed some unnecessary casts and whitespace
  on save. Also removed unhelpful "(non-Javadoc)" comments from overridden
  methods.
Merge branch '1.4.6-SNAPSHOT' into 1.5.2-SNAPSHOT

Conflicts:
	core/src/main/java/org/apache/accumulo/core/client/admin/TableOperations.java
	core/src/main/java/org/apache/accumulo/core/client/admin/TableOperationsImpl.java
	core/src/main/java/org/apache/accumulo/core/client/impl/ConnectorImpl.java
	core/src/main/java/org/apache/accumulo/core/client/mock/MockInstanceOperations.java
	core/src/main/java/org/apache/accumulo/core/iterators/FirstEntryInRowIterator.java
	core/src/main/java/org/apache/accumulo/core/iterators/IteratorUtil.java
	core/src/main/java/org/apache/accumulo/core/iterators/user/IntersectingIterator.java
	core/src/main/java/org/apache/accumulo/core/security/ColumnVisibility.java
	core/src/test/java/org/apache/accumulo/core/iterators/user/CombinerTest.java
	examples/simple/src/main/java/org/apache/accumulo/examples/simple/shard/Query.java
	minicluster/src/main/java/org/apache/accumulo/minicluster/MiniAccumuloCluster.java
	server/src/main/java/org/apache/accumulo/server/master/balancer/TabletBalancer.java
	server/src/main/java/org/apache/accumulo/server/util/AddFilesWithMissingEntries.java
	server/src/main/java/org/apache/accumulo/server/util/DumpZookeeper.java
	server/src/main/java/org/apache/accumulo/server/util/FindOfflineTablets.java
	server/src/main/java/org/apache/accumulo/server/util/MetadataTable.java
	server/src/main/java/org/apache/accumulo/server/util/RestoreZookeeper.java
	server/src/main/java/org/apache/accumulo/server/util/SendLogToChainsaw.java
	server/src/main/java/org/apache/accumulo/server/util/TableDiskUsage.java
	server/src/main/java/org/apache/accumulo/server/util/TabletServerLocks.java
	src/core/src/main/java/org/apache/accumulo/core/client/mapreduce/InputFormatBase.java
	src/core/src/main/java/org/apache/accumulo/core/file/map/MapFileUtil.java
	src/server/src/main/java/org/apache/accumulo/server/util/DumpMapFile.java
	src/server/src/main/java/org/apache/accumulo/server/util/DumpTabletsOnServer.java
	test/src/main/java/org/apache/accumulo/test/continuous/ContinuousMoru.java
	test/src/main/java/org/apache/accumulo/test/randomwalk/concurrent/CheckBalance.java
	trace/src/main/java/org/apache/accumulo/trace/instrument/receivers/ZooSpanClient.java