software/erp5: tcpv4-port is not required for kumofs and smtp

This propery has a default, which indicates that it is not required.

software/erp5/instance-kumofs-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "type": "object",
-  "required": [
-    "tcpv4-port"
-  ],
   "properties": {
     "tcpv4-port": {
       "allOf": [

software/erp5/instance-smtp-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
-  "required": [
-    "tcpv4-port"
-  ],
   "type": "object",
   "properties": {
     "tcpv4-port": {