added a bunch more forbidden usernames

provider_base/services/webapp.json

 {
   "webapp": {
     "admins": [],
-    "forbidden_usernames": ["admin", "administrator", "arin-admin", "certmaster", "contact", "info", "maildrop", "postmaster", "ssladmin", "www-data", "vmail"],
+    "forbidden_usernames": [
+      "admin", "admins", "administrator", "administrators", "arin-admin",
+      "certmaster", "contact", "email", "help", "help-desk", "help-ticket",
+      "help-tickets", "help_desk", "help_ticket", "help_tickets", "helpdesk",
+      "helpticket", "helptickets", "info", "mail", "maildrop", "noreply",
+      "owner", "owners", "postmaster", "reply", "robot", "ssladmin", "staff",
+      "support", "tech-support", "tech_support", "techsupport", "ticket",
+      "tickets", "vmail", "www-data"],
     "domain": "= domain.full_suffix",
     "modules": ["user", "billing", "help"],
     "couchdb_webapp_user": "= global.services[:couchdb].couch.users[:webapp]",