sh portability changes

tests/scripts/acfilter.sh

tests/scripts/all

tests/scripts/defines.sh

tests/scripts/makeldbm.sh

tests/scripts/test001-ldif2ldbm

tests/scripts/test001-slapadd

tests/scripts/test002-populate

tests/scripts/test003-search

tests/scripts/test004-modify

tests/scripts/test005-modrdn

tests/scripts/test006-acls

tests/scripts/test007-replication

tests/scripts/test008-concurrency