Bug#17661 information_schema.SCHEMATA returns uppercase with lower_case_table_names = 1

fix: return db name for I_S.TABLES(and others) in original letter case.
if mysql starts with lower_case_table_names=1 | 2 then original db name is converted
to lower case(for I_S tables). It happens when we perform add_table_to_list. 
to avoid this we make a copy of original db name and use the copy hereafter.


mysql-test/r/lowercase_table2.result:
  Bug#17661 information_schema.SCHEMATA returns uppercase with lower_case_table_names = 1
  test case
mysql-test/t/lowercase_table2.test:
  Bug#17661 information_schema.SCHEMATA returns uppercase with lower_case_table_names = 1
  test case

1 files changed, 9 insertions, 0 deletions

diff --git a/mysql-test/r/lowercase_table2.result b/mysql-test/r/lowercase_table2.result
index 44235cbf900..e369fb7e482 100644
--- a/mysql-test/r/lowercase_table2.result
+++ b/mysql-test/r/lowercase_table2.result
@@ -165,3 +165,12 @@ create table t1Aa (col1 int);
 select t1Aa.col1 from t1aA,t2Aa where t1Aa.col1 = t2aA.col1;
 col1
 drop table t2aA, t1Aa;
+create database mysqltest_LC2;
+use mysqltest_LC2;
+create table myUC (i int);
+select TABLE_SCHEMA,TABLE_NAME FROM information_schema.TABLES
+where TABLE_SCHEMA ='mysqltest_LC2';
+TABLE_SCHEMA	TABLE_NAME
+mysqltest_LC2	myUC
+use test;
+drop database mysqltest_LC2;