Use 'cachesize 0' for repl and acl tests.

Remove disable write sync (dbcachenowsync) in master (for concurrency test).

tests/data/slapd-acl.conf

@@ -12,6 +12,7 @@ argsfile    ./test-db/slapd.args
 #######################################################################
 
 database	ldbm
+cachesize	0
 suffix		"o=University of Michigan, c=US"
 directory	./test-db
 rootdn		"cn=Manager, o=University of Michigan, c=US"

tests/data/slapd-bdb2-acl.conf

@@ -15,6 +15,7 @@ backend     bdb2
 home        ./test-db
 
 database	bdb2
+cachesize	0
 suffix		"o=University of Michigan, c=US"
 directory	./test-db
 rootdn		"cn=Manager, o=University of Michigan, c=US"

tests/data/slapd-bdb2-master.conf

@@ -16,7 +16,6 @@ home		./test-db
 mpoolsize	21000000
 
 database	bdb2
-cachesize	4
 suffix		"o=University of Michigan, c=US"
 directory	./test-db
 rootdn		"cn=Manager, o=University of Michigan, c=US"

tests/data/slapd-bdb2-repl-master.conf

@@ -15,6 +15,7 @@ backend		bdb2
 home		./test-db
 
 database	bdb2
+cachesize	0
 suffix		"o=University of Michigan, c=US"
 directory	./test-db
 rootdn		"cn=Manager, o=University of Michigan, c=US"

tests/data/slapd-bdb2-repl-slave.conf

@@ -15,6 +15,7 @@ backend     bdb2
 home        ./test-repl
 
 database	bdb2
+cachesize	0
 suffix		"o=University of Michigan, c=US"
 directory	./test-repl
 rootdn		"cn=Manager, o=University of Michigan, c=US"

tests/data/slapd-master.conf

@@ -12,7 +12,6 @@ argsfile    ./test-db/slapd.args
 #######################################################################
 
 database	ldbm
-cachesize	4
 suffix		"o=University of Michigan, c=US"
 directory	./test-db
 rootdn		"cn=Manager, o=University of Michigan, c=US"
@@ -20,3 +19,4 @@ rootpw		secret
 index		cn,sn,uid	pres,eq,approx
 index		default		none
 lastmod		on
+dbcachenowsync

tests/data/slapd-repl-master.conf

@@ -12,6 +12,7 @@ argsfile    ./test-db/slapd.args
 #######################################################################
 
 database	ldbm
+cachesize	0
 suffix		"o=University of Michigan, c=US"
 directory	./test-db
 rootdn		"cn=Manager, o=University of Michigan, c=US"

tests/data/slapd-repl-slave.conf

@@ -12,6 +12,7 @@ argsfile    ./test-repl/slapd.args
 #######################################################################
 
 database	ldbm
+cachesize	0
 suffix		"o=University of Michigan, c=US"
 directory	./test-repl
 rootdn		"cn=Manager, o=University of Michigan, c=US"
@@ -21,4 +22,3 @@ index		cn,sn,uid	pres,eq,approx
 index		default		none
 # index		default		pres,eq,approx
 lastmod		on
-dbcachenowsync