Fix local_directory_table_mixed test cases will make standby start fa…

…iled

In the test case `local_directory_table_mixed`, created the tablespace
`directory_tblspc` which depends on the local dir `@testtablespace@`.
But in the end of test, we will remove the local dir `@testtablespace@`,
This will cause an error when replaying the WAL log in standby.

Also we should not use the `@testtablespace@`, but with a subdir in this
dir.

src/test/isolation2/input/local_directory_table_mixed.source

@@ -1,9 +1,9 @@
 -- Mixed test for local directory table
 -- setup for temp tablespace
-! rm -rf '@testtablespace@';
-! mkdir -p '@testtablespace@';
+! rm -rf '@testtablespace@/local_directory_table_mixed/';
+! mkdir -p '@testtablespace@/local_directory_table_mixed/';
 DROP TABLESPACE IF EXISTS directory_tblspc;
-CREATE TABLESPACE directory_tblspc LOCATION '@testtablespace@';
+CREATE TABLESPACE directory_tblspc LOCATION '@testtablespace@/local_directory_table_mixed/';
 
 CREATE EXTENSION IF NOT EXISTS gp_inject_fault;
 
@@ -128,7 +128,6 @@ CREATE EXTENSION IF NOT EXISTS gp_inject_fault;
 1: COMMIT;
 2: COMMIT;
 
-! rm -rf '@testtablespace@';
 DROP TABLESPACE directory_tblspc;
 DROP DIRECTORY TABLE dir_table1;
 DROP DIRECTORY TABLE dir_table2;

src/test/isolation2/output/local_directory_table_mixed.source

@@ -1,12 +1,12 @@
 -- Mixed test for local directory table
 -- setup for temp tablespace
-! rm -rf '@testtablespace@';
+! rm -rf '@testtablespace@/local_directory_table_mixed/';
 
-! mkdir -p '@testtablespace@';
+! mkdir -p '@testtablespace@/local_directory_table_mixed/';
 
 DROP TABLESPACE IF EXISTS directory_tblspc;
 DROP
-CREATE TABLESPACE directory_tblspc LOCATION '@testtablespace@';
+CREATE TABLESPACE directory_tblspc LOCATION '@testtablespace@/local_directory_table_mixed/';
 CREATE
 
 CREATE EXTENSION IF NOT EXISTS gp_inject_fault;
@@ -370,8 +370,6 @@ COMMIT
 2: COMMIT;
 COMMIT
 
-! rm -rf '@testtablespace@';
-
 DROP TABLESPACE directory_tblspc;
 ERROR:  tablespace "directory_tblspc" cannot be dropped because some objects depend on it
 DETAIL:  tablespace for directory table dir_table1