stack/erp5/instance-erp5.cfg.in: Cleanup "directory" section.

Remove unused "plugin" entry.
Add locally-referenced-but-defined-by-another-file "bin".

stack/erp5/buildout.hash.cfg

@@ -74,7 +74,7 @@ md5sum = b5ac16fdeed8863e465e955ba6d1e12a
 
 [template-erp5]
 filename = instance-erp5.cfg.in
-md5sum = 5ea4bcdf74fb429f254af8e8fb7b38a3
+md5sum = edfd681e3a477855a581f8d01c717a92
 
 [template-zeo]
 filename = instance-zeo.cfg.in

stack/erp5/instance-erp5.cfg.in

@@ -64,9 +64,8 @@ config-name = {{ name }}
 
 [directory]
 recipe = slapos.cookbook:mkdirectory
-etc = ${buildout:directory}/etc
-plugin = ${:etc}/plugin
-service-on-watch = ${:etc}/service
+bin = ${buildout:directory}/bin
+service-on-watch = ${buildout:directory}/etc/service
 srv = ${buildout:directory}/srv
 backup-caucased = ${:srv}/backup/caucased