squash! Skip attempts to create target gp tablespace.

Setup the new tests in the isolation2_schedule.

src/test/isolation2/isolation2_schedule

@@ -139,7 +139,8 @@ test: segwalrep/fts_unblock_primary
 test: segwalrep/mirror_promotion
 test: segwalrep/cancel_commit_pending_replication
 test: segwalrep/twophase_tolerance_with_mirror_promotion
-test: segwalrep/pg_basebackup
+test: pg_basebackup
+test: pg_basebackup_with_tablespaces
 
 # Tests for crash recovery
 test: crash_recovery