Change the backup_from_standby test item.

Change the backup_from_standby test item because it is not possible
to create a streaming replication with external tablespaces on one localhost.
So I removed command about created external tablespace.
And I used pg_basebackp command to replaced pg_backup_start() and pg_backup_stop().

sql/backup_from_standby.sh

@@ -63,10 +63,8 @@ function cleanup()
     rm -fr ${BACKUP_PATH}
     rm -fr ${ARCLOG_PATH}
     rm -fr ${SRVLOG_PATH}
-    rm -fr ${TBLSPC_PATH}
     mkdir -p ${ARCLOG_PATH}
     mkdir -p ${SRVLOG_PATH}
-    mkdir -p ${TBLSPC_PATH}
 }
 
 function init_backup()
@@ -101,10 +99,8 @@ EOF
 
     # start PostgreSQL
     pg_ctl start -D ${PGDATA_PATH} -w -t 300 > /dev/null 2>&1
-	mkdir -p ${TBLSPC_PATH}/pgbench	
 	psql --no-psqlrc -p ${TEST_PGPORT} -d postgres > /dev/null 2>&1 << EOF
-CREATE TABLESPACE pgbench LOCATION '${TBLSPC_PATH}/pgbench';
-CREATE DATABASE pgbench TABLESPACE = pgbench;
+CREATE DATABASE pgbench;
 EOF
 
     pgbench -i -s $SCALE -p ${TEST_PGPORT} -d pgbench > ${TEST_BASE}/pgbench.log 2>&1
@@ -119,16 +115,7 @@ function init_catalog()
 
 function setup_standby()
 {
-	psql --no-psqlrc -p ${TEST_PGPORT} -d postgres -c "SELECT pg_start_backup('sby-bkp-test', true)"  > /dev/null 2>&1
-
-	rm -rf ${SBYDATA_PATH}
-	cp -r ${PGDATA_PATH} ${SBYDATA_PATH}
-	rm ${SBYDATA_PATH}/postmaster.*
-
-	psql --no-psqlrc -p ${TEST_PGPORT} -d postgres > /dev/null 2>&1 << EOF
-SELECT pg_stop_backup();
-EOF
-
+	pg_basebackup -d "dbname=pgbench host=localhost port=${TEST_PGPORT}" -D ${SBYDATA_PATH}  --checkpoint=fast > /dev/null 2>&1
 	cp ${SBYDATA_PATH}/postgresql.conf_org ${SBYDATA_PATH}/postgresql.conf
 	cat >> ${SBYDATA_PATH}/postgresql.conf << EOF
 port = ${TEST_SBYPGPORT}
@@ -280,4 +267,4 @@ rm -rf ${SBYDATA_PATH}
 rm -fr ${BACKUP_PATH}
 rm -fr ${ARCLOG_PATH}
 rm -fr ${SRVLOG_PATH}
-rm -fr ${TBLSPC_PATH}
+