stack/erp5: Shorten haproxy socket path

Without this we sometimes hit the socket path length limit when testing
ERP5 inside Theia inside erp5testnode.

stack/erp5/buildout.hash.cfg

@@ -90,7 +90,7 @@ md5sum = 09895deebca3206425fada3caf1d92cf
 
 [template-balancer]
 filename = instance-balancer.cfg.in
-md5sum = d6166515fda7b09df754672536b131be
+md5sum = cbcbe2daf3a51dfab50446a18c0be76e
 
 [template-haproxy-cfg]
 filename = haproxy.cfg.in

stack/erp5/instance-balancer.cfg.in

@@ -189,7 +189,7 @@ cert = ${haproxy-conf-ssl:certificate}
 ca-cert = ${haproxy-conf-ssl:ca-cert}
 crl = ${haproxy-conf-ssl:crl}
 {% endif %}
-stats-socket = ${directory:run}/haproxy.sock
+stats-socket = ${directory:run}/ha.sock
 path-routing-list = {{ dumps(slapparameter_dict['path-routing-list']) }}
 family-path-routing-dict = {{ dumps(slapparameter_dict['family-path-routing-dict']) }}
 pidfile = ${directory:run}/haproxy.pid