IMPALA-3786: Replace "cloudera" with "apache" (part 2)

As part of the ASF transition, we need to replace references to
Cloudera in Impala with references to Apache. This primarily means
changing Java package names from com.cloudera.impala.* to
org.apache.impala.*

A prior patch renamed all the files as necessary, and this patch
performs the actual code changes. Most of the changes in this patch
were generated with some commands of the form:

find . | grep "\.java\|\.py\|\.h\|\.cc" | \
  xargs sed -i s/'com\(.\)cloudera\(\.\)impala/org\1apache\2impala/g

along with some manual fixes.

After this patch, the remaining references to Cloudera in the repo
mostly fall into the categories:
- External components that have cloudera in their own package names,
  eg. com.cloudera.kudu/llama
- URLs, eg. https://repository.cloudera.com/

Change-Id: I0d35fa6602a7fc0c212b2ef5e2b3322b77dde7e2
Reviewed-on: http://gerrit.cloudera.org:8080/3937
Reviewed-by: Thomas Tauber-Marshall <tmarshall@cloudera.com>
Reviewed-by: Jim Apple <jbapple@cloudera.com>
Tested-by: Internal Jenkins

testdata/bin/create-data-source-table.sql

@@ -23,7 +23,7 @@ USE functional;
 DROP DATA SOURCE IF EXISTS AllTypesDataSource;
 CREATE DATA SOURCE AllTypesDataSource
 LOCATION '/test-warehouse/data-sources/test-data-source.jar'
-CLASS 'com.cloudera.impala.extdatasource.AllTypesDataSource'
+CLASS 'org.apache.impala.extdatasource.AllTypesDataSource'
 API_VERSION 'V1';
 
 DROP TABLE IF EXISTS alltypes_datasource;