testnode: used self signed certificate for shellinabox

Since Caddy 0.11.1, certificates has to match sites
(Thanks Luke)

software/erp5testnode/buildout.hash.cfg

@@ -18,4 +18,4 @@ md5sum = 307663d73ef3ef94b02567ecd322252e
 
 [template-default]
 filename = instance-default.cfg
-md5sum = c85bd43145c7d21321546f988aebbfc7
+md5sum = de56145079f33f78d6bcf140f6caf2f3

software/erp5testnode/instance-default.cfg

@@ -94,7 +94,7 @@ rendered = $${directory:etc}/$${:_buildout_section_name_}
 template = inline:
   https://$${:hostname}:$${:port} {
     bind $${:ipv6}
-    tls $${:cert-file} $${:key-file}
+    tls self_signed
     gzip
     log stdout
     errors stderr