on Solaris, /bin/sh is not bash; grep doesn't like ^auditcontext: without quotes

tests/scripts/test043-delta-syncrepl

@@ -339,9 +339,9 @@ fi
 test $KILLSERVERS != no && kill -HUP $KILLPIDS
 
 echo "Filtering producer results..."
-. $LDIFFILTER < $MASTEROUT | grep -iv ^auditcontext: > $MASTERFLT
+. $LDIFFILTER < $MASTEROUT | grep -iv "^auditcontext:" > $MASTERFLT
 echo "Filtering consumer results..."
-. $LDIFFILTER < $SLAVEOUT | grep -iv ^auditcontext: > $SLAVEFLT
+. $LDIFFILTER < $SLAVEOUT | grep -iv "^auditcontext:" > $SLAVEFLT
 
 echo "Comparing retrieved entries from producer and consumer..."
 $CMP $MASTERFLT $SLAVEFLT > $CMPOUT