Database name in the meta information of Show Tables query

[GuptaManan100]

Overview of the Issue

On running show tables in a keyspace named ks, the name of the database in the result should be information_schema and not ks.

Reproduction Steps

Found via an e2e test added in the testing mode found at https://github.com/planetscale/vitess/tree/testing-vtgate
Run the tests in the package and look at the logs.

Log Fragments

E0119 09:54:50.189567   64834 conn.go:1037] Outputs from both sources are different, Difference :  (*sqltypes.Result)(
- 	&{
- 		Fields: []*query.Field{
- 			s`name:"Tables_in_vt_ks" type:VARCHAR table:"TABLE_NAMES" org_table:"TABLE_NAMES" database:"ks" org_name:"TABLE_NAME" column_length:192 charset:33 flags:1 `,
- 		},
- 		RowsAffected: 0x10,
- 		Rows: [][]sqltypes.Value{
- 			{s`VARCHAR("aggr_test")`},
- 			{s`VARCHAR("t1")`},
- 			{s`VARCHAR("t1_id2_idx")`},
- 			{s`VARCHAR("t2")`},
- 			{s`VARCHAR("t2_id4_idx")`},
- 			{s`VARCHAR("t3")`},
- 			{s`VARCHAR("t3_id7_idx")`},
- 			{s`VARCHAR("t4")`},
- 			{s`VARCHAR("t4_id2_idx")`},
- 			{s`VARCHAR("t5_null_vindex")`},
- 			{s`VARCHAR("t6")`},
- 			{s`VARCHAR("t6_id2_idx")`},
- 			{s`VARCHAR("t7_fk")`},
- 			{s`VARCHAR("t7_xxhash")`},
- 			{s`VARCHAR("t7_xxhash_idx")`},
- 			{s`VARCHAR("vstream_test")`},
- 		},
- 	},
+ 	&{
+ 		Fields: []*query.Field{
+ 			s`name:"Tables_in_ks" type:VARCHAR table:"TABLE_NAMES" org_table:"TABLE_NAMES" database:"information_schema" org_name:"TABLE_NAME" column_length:192 charset:33 flags:1 `,
+ 		},
+ 		RowsAffected: 0x10,
+ 		Rows: [][]sqltypes.Value{
+ 			{s`VARCHAR("aggr_test")`},
+ 			{s`VARCHAR("t1")`},
+ 			{s`VARCHAR("t1_id2_idx")`},
+ 			{s`VARCHAR("t2")`},
+ 			{s`VARCHAR("t2_id4_idx")`},
+ 			{s`VARCHAR("t3")`},
+ 			{s`VARCHAR("t3_id7_idx")`},
+ 			{s`VARCHAR("t4")`},
+ 			{s`VARCHAR("t4_id2_idx")`},
+ 			{s`VARCHAR("t5_null_vindex")`},
+ 			{s`VARCHAR("t6")`},
+ 			{s`VARCHAR("t6_id2_idx")`},
+ 			{s`VARCHAR("t7_fk")`},
+ 			{s`VARCHAR("t7_xxhash")`},
+ 			{s`VARCHAR("t7_xxhash_idx")`},
+ 			{s`VARCHAR("vstream_test")`},
+ 		},
+ 	},
  )