KUDU-3306: fix PartitionSchema::DecodeRangeKey

Prior to this patch, we didn't copy BINARY values into KuduPartialRow
in PartitionSchema::DecodeRangeKey, which lead to issues while copying
tables with string, binary and varchar columns in their range key.

Change-Id: I5abf7ff9713ee391199c47710ccd81db8b97653e
Reviewed-on: http://gerrit.cloudera.org:8080/18733
Reviewed-by: Alexey Serbin <alexey@apache.org>
Tested-by: Alexey Serbin <alexey@apache.org>
2 files changed