This ticket allows to disable the instance dir.
Ticket #47840 - add configure option to disable instance specific scripts

Currently, the instance dir and the instance specific scripts are generated by default. But it may be altered some time.

Date:   Thu Apr 7 14:59:06 2016 +1000    
Bug Description:  During the change, 47840, per instance scripts defaulted
to false if not defined in setup.inf.

Fix Description:  reset the default to true, and allow setting to false if
required. This may change in a future release.

Before it occurs, the paths and the options for these scripts need to be adjusted.
$ egrep "instdir|instancedir" *.pl
70upgradefromldif.pl: my $instdir = $config_entry->getValues('nsslapd-instancedir');
70upgradefromldif.pl: @errs = importLDIF($conn, $file, $dbinst, $isrunning, $instdir);
70upgradefromldif.pl: my ($conn, $file, $be, $isrunning, $instdir, $rc) = @_;
70upgradefromldif.pl: if ($rc = system("$instdir/ldif2db -n $be -i $file > /dev/null 2>&1")) {
82targetuniqueidindex.pl: my $instancedir = $config->getValues('nsslapd-instancedir');
82targetuniqueidindex.pl: my $reindex = $instancedir . "/db2index";
90subtreerename.pl: my $instdir = $ent0->getValue('nsslapd-instancedir');
90subtreerename.pl: my $prog = $instdir . "/dn2rdn";
91reindex.pl: my $instancedir = $config->getValues('nsslapd-instancedir');
91reindex.pl: my $reindex = $instancedir . "/db2index";
91subtreereindex.pl: my $instancedir = $config->getValues('nsslapd-instancedir');
91subtreereindex.pl: my $reindex = $instancedir . "/db2index";