[SPARK-17660][SQL] DESC FORMATTED for VIEW Lacks View Definition

### What changes were proposed in this pull request?
Before this PR, `DESC FORMATTED` does not have a section for the view definition. We should add it for permanent views, like what Hive does.

```
+----------------------------+-------------------------------------------------------------------------------------------------------------------------------------+-------+
|col_name                    |data_type                                                                                                                            |comment|
+----------------------------+-------------------------------------------------------------------------------------------------------------------------------------+-------+
|a                           |int                                                                                                                                  |null   |
|                            |                                                                                                                                     |       |
|# Detailed Table Information|                                                                                                                                     |       |
|Database:                   |default                                                                                                                              |       |
|Owner:                      |xiaoli                                                                                                                               |       |
|Create Time:                |Sat Sep 24 21:46:19 PDT 2016                                                                                                         |       |
|Last Access Time:           |Wed Dec 31 16:00:00 PST 1969                                                                                                         |       |
|Location:                   |                                                                                                                                     |       |
|Table Type:                 |VIEW                                                                                                                                 |       |
|Table Parameters:           |                                                                                                                                     |       |
|  transient_lastDdlTime     |1474778779                                                                                                                           |       |
|                            |                                                                                                                                     |       |
|# Storage Information       |                                                                                                                                     |       |
|SerDe Library:              |org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe                                                                                   |       |
|InputFormat:                |org.apache.hadoop.mapred.SequenceFileInputFormat                                                                                     |       |
|OutputFormat:               |org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat                                                                            |       |
|Compressed:                 |No                                                                                                                                   |       |
|Storage Desc Parameters:    |                                                                                                                                     |       |
|  serialization.format      |1                                                                                                                                    |       |
|                            |                                                                                                                                     |       |
|# View Information          |                                                                                                                                     |       |
|View Original Text:         |SELECT * FROM tbl                                                                                                                    |       |
|View Expanded Text:         |SELECT `gen_attr_0` AS `a` FROM (SELECT `gen_attr_0` FROM (SELECT `a` AS `gen_attr_0` FROM `default`.`tbl`) AS gen_subquery_0) AS tbl|       |
+----------------------------+-------------------------------------------------------------------------------------------------------------------------------------+-------+
```

### How was this patch tested?
Added a test case

Author: gatorsmile <gatorsmile@gmail.com>

Closes #15234 from gatorsmile/descFormattedView.