HUDI-123 Rename code packages/constants to org.apache.hudi (#830)

- Rename com.uber.hoodie to org.apache.hudi
- Flag to pass com.uber.hoodie Input formats for hoodie-sync
- Works with HUDI demo. 
- Also tested for backwards compatibility with datasets built by com.uber.hoodie packages
- Migration guide : https://cwiki.apache.org/confluence/display/HUDI/Migration+Guide+From+com.uber.hoodie+to+org.apache.hudi

hudi-spark/run_hoodie_app.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+function error_exit {
+    echo "$1" >&2   ## Send message to stderr. Exclude >&2 if you don't want it that way.
+    exit "${2:-1}"  ## Return a code specified by $2 or 1 by default.
+}
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+#Ensure we pick the right jar even for hive11 builds
+HUDI_JAR=`ls -c $DIR/../packaging/hudi-spark-bundle/target/hudi-spark-bundle-*.jar | grep -v source | head -1`
+
+if [ -z "$HADOOP_CONF_DIR" ]; then
+  echo "setting hadoop conf dir"
+  HADOOP_CONF_DIR="/etc/hadoop/conf"
+fi
+
+if [ -z "$CLIENT_JAR" ]; then
+  echo "client jar location not set"
+fi
+
+OTHER_JARS=`ls -1 $DIR/target/lib/*jar | grep -v '*avro*-1.' | tr '\n' ':'`
+#TODO - Need to move TestDataGenerator and HoodieJavaApp out of tests
+echo "Running command : java -cp $DIR/target/test-classes/:$DIR/../hudi-client/target/test-classes/:${HADOOP_CONF_DIR}:$HUDI_JAR:${CLIENT_JAR}:$OTHER_JARS HoodieJavaApp $@"
+java -Xmx1G -cp $DIR/target/test-classes/:$DIR/../hudi-client/target/test-classes/:${HADOOP_CONF_DIR}:$HUDI_JAR:${CLIENT_JAR}:$OTHER_JARS HoodieJavaApp "$@"