isolation2: Fix Makefile to run test manually

Author: Xin Zhang <xzhang@pivotal.io>
Author: Ashwin Agrawal <aagrawal@pivotal.io>

src/test/isolation2/Makefile

@@ -55,7 +55,7 @@ install: all gpdiff.pl gpstringsubs.pl
 installcheck: install
 	./pg_isolation2_regress --init-file=$(top_builddir)/src/test/regress/init_file --init-file=./init_file_isolation2 --psqldir='$(PSQLDIR)' --inputdir=$(srcdir) --ao-dir=uao --schedule=$(srcdir)/isolation2_schedule
 
-installcheck-resgroup: all gpdiff.pl gpstringsubs.pl prepare_dblink_sql
+installcheck-resgroup: install prepare_dblink_sql
 	./pg_isolation2_regress --init-file=$(top_builddir)/src/test/regress/init_file --init-file=./init_file_resgroup --psqldir='$(PSQLDIR)' --inputdir=$(srcdir) --resgroup-dir=resgroup --dbname=isolation2resgrouptest --schedule=$(srcdir)/isolation2_resgroup_schedule
 
 prepare_dblink_sql: