Fix directory table ci pipeline problems. (#414)

Keep test env clean to make sure test pass.

Author: zhangwenchao-123

src/test/isolation2/input/local_directory_table_mixed.source

@@ -2,6 +2,7 @@
 -- setup for temp tablespace
 ! rm -rf '@testtablespace@';
 ! mkdir -p '@testtablespace@';
+DROP TABLESPACE IF EXISTS directory_tblspc;
 CREATE TABLESPACE directory_tblspc LOCATION '@testtablespace@';
 
 CREATE EXTENSION IF NOT EXISTS gp_inject_fault;

src/test/isolation2/output/local_directory_table_mixed.source

@@ -4,6 +4,8 @@
 
 ! mkdir -p '@testtablespace@';
 
+DROP TABLESPACE IF EXISTS directory_tblspc;
+DROP
 CREATE TABLESPACE directory_tblspc LOCATION '@testtablespace@';
 CREATE
 

src/test/regress/input/directory_table.source

@@ -644,4 +644,6 @@ DROP TRIGGER IF EXISTS trigtest_a_row_tg_dirtable_1 ON dir_table1;
 DROP TRIGGER IF EXISTS trigtest_b_stmt_tg_dirtable_1 ON dir_table1;
 DROP TRIGGER IF EXISTS trigtest_a_stmt_tg_dirtable_1 ON dir_table1;
 
-DROP TABLESPACE directory_tblspc;
+\!rm -rf @testtablespace@;
+
+DROP TABLESPACE directory_tblspc;

src/test/regress/output/directory_table.source

@@ -1844,4 +1844,5 @@ DROP TRIGGER IF EXISTS trigtest_b_stmt_tg_dirtable_1 ON dir_table1;
 NOTICE:  relation "dir_table1" does not exist, skipping
 DROP TRIGGER IF EXISTS trigtest_a_stmt_tg_dirtable_1 ON dir_table1;
 NOTICE:  relation "dir_table1" does not exist, skipping
+\!rm -rf @testtablespace@;
 DROP TABLESPACE directory_tblspc;

src/test/regress/output/directory_table_optimizer.source

@@ -1839,4 +1839,5 @@ DROP TRIGGER IF EXISTS trigtest_b_stmt_tg_dirtable_1 ON dir_table1;
 NOTICE:  relation "dir_table1" does not exist, skipping
 DROP TRIGGER IF EXISTS trigtest_a_stmt_tg_dirtable_1 ON dir_table1;
 NOTICE:  relation "dir_table1" does not exist, skipping
+\!rm -rf @testtablespace@;
 DROP TABLESPACE directory_tblspc;