change tests according to suggestions

examples/broadcast1.c

examples/broken_barrier.c

examples/concurrent_receive.c

examples/deadlock1.c

examples/deadlock2.c

examples/deadlock3.c

examples/deadlock4.c

examples/deadlock5.c

examples/deadlock6.c

examples/reduce.c

examples/tag_filter.c

tests/deadlock1.sh

tests/pangolingila/broadcast_root.sh

tests/pangolingila/broken_barrier.sh

tests/pangolingila/concurrent_receive.self

tests/pangolingila/deadlock1.sh

tests/pangolingila/delayed_recv.self

tests/pangolingila/reduce_root.sh

tests/pangolingila/size_filter.self

tests/pangolingila/tag_filter.self