[HUDI-744] Restructure hudi-common and clean up files under util packages (#1462)

- Brings more order and cohesion to the classes in hudi-common
 - Utils classes related to a particular concept (avro, timeline,...) are placed near to the package
 - common.fs package now contains all the filesystem level classes including wrapper filesystem
 - bloom.filter package renamed to just bloom
 - config package contains classes that help store properties
 - common.fs.inline package contains all the inline filesystem classes/impl
 - common.table.timeline now consolidates all timeline related classes
 - common.table.view consolidates all the classes related to filesystem view metadata
 - common.table.timeline.versioning contains all classes related to versioning of timeline
 - Fix few unit tests as a result
 - Moved the test packages around to match the source file move
 - Rename AvroUtils to TimelineMetadataUtils & minor fixes/typos

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/HoodieParquetInputFormat.java

@@ -45,8 +45,8 @@ import org.apache.hudi.common.model.HoodieCommitMetadata;
 import org.apache.hudi.common.model.HoodieBaseFile;
 import org.apache.hudi.common.model.HoodiePartitionMetadata;
 import org.apache.hudi.common.table.HoodieTableMetaClient;
-import org.apache.hudi.common.table.HoodieTimeline;
-import org.apache.hudi.common.table.TableFileSystemView.BaseFileOnlyView;
+import org.apache.hudi.common.table.timeline.HoodieTimeline;
+import org.apache.hudi.common.table.view.TableFileSystemView.BaseFileOnlyView;
 import org.apache.hudi.common.table.timeline.HoodieInstant;
 import org.apache.hudi.common.table.view.HoodieTableFileSystemView;
 import org.apache.hudi.common.util.StringUtils;

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/HoodieROTablePathFilter.java

@@ -18,7 +18,7 @@
 
 package org.apache.hudi.hadoop;
 
-import org.apache.hudi.common.SerializableConfiguration;
+import org.apache.hudi.common.config.SerializableConfiguration;
 import org.apache.hudi.common.model.HoodieBaseFile;
 import org.apache.hudi.common.model.HoodiePartitionMetadata;
 import org.apache.hudi.common.table.HoodieTableMetaClient;

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/AbstractRealtimeRecordReader.java

@@ -20,8 +20,8 @@ package org.apache.hudi.hadoop.realtime;
 
 import org.apache.hudi.common.model.HoodieAvroPayload;
 import org.apache.hudi.common.table.HoodieTableMetaClient;
-import org.apache.hudi.common.util.HoodieAvroUtils;
-import org.apache.hudi.common.util.LogReaderUtils;
+import org.apache.hudi.avro.HoodieAvroUtils;
+import org.apache.hudi.common.table.log.LogReaderUtils;
 import org.apache.hudi.common.util.collection.Pair;
 import org.apache.hudi.exception.HoodieException;
 import org.apache.hudi.exception.HoodieIOException;

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/HoodieParquetRealtimeInputFormat.java

@@ -22,11 +22,11 @@ import org.apache.hudi.common.model.FileSlice;
 import org.apache.hudi.common.model.HoodieLogFile;
 import org.apache.hudi.common.model.HoodieRecord;
 import org.apache.hudi.common.table.HoodieTableMetaClient;
-import org.apache.hudi.common.table.HoodieTimeline;
+import org.apache.hudi.common.table.timeline.HoodieTimeline;
 import org.apache.hudi.common.table.timeline.HoodieInstant;
 import org.apache.hudi.common.table.view.HoodieTableFileSystemView;
 import org.apache.hudi.common.util.CollectionUtils;
-import org.apache.hudi.common.util.FSUtils;
+import org.apache.hudi.common.fs.FSUtils;
 import org.apache.hudi.common.util.Option;
 import org.apache.hudi.common.util.ValidationUtils;
 import org.apache.hudi.exception.HoodieException;

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/RealtimeCompactedRecordReader.java

@@ -21,8 +21,8 @@ package org.apache.hudi.hadoop.realtime;
 import org.apache.hudi.common.model.HoodieRecord;
 import org.apache.hudi.common.model.HoodieRecordPayload;
 import org.apache.hudi.common.table.log.HoodieMergedLogRecordScanner;
-import org.apache.hudi.common.util.FSUtils;
-import org.apache.hudi.common.util.HoodieAvroUtils;
+import org.apache.hudi.common.fs.FSUtils;
+import org.apache.hudi.avro.HoodieAvroUtils;
 import org.apache.hudi.common.util.Option;
 
 import org.apache.avro.generic.GenericRecord;

hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/RealtimeUnmergedRecordReader.java

@@ -20,7 +20,7 @@ package org.apache.hudi.hadoop.realtime;
 
 import org.apache.hudi.common.table.log.HoodieUnMergedLogRecordScanner;
 import org.apache.hudi.common.util.DefaultSizeEstimator;
-import org.apache.hudi.common.util.FSUtils;
+import org.apache.hudi.common.fs.FSUtils;
 import org.apache.hudi.common.util.Option;
 import org.apache.hudi.common.util.queue.BoundedInMemoryExecutor;
 import org.apache.hudi.common.util.queue.BoundedInMemoryQueueProducer;