Add ssh banner to ssh-auth-methods

scripts/ssh-auth-methods.nse

@@ -16,10 +16,20 @@ username which may be invalid. The abandoned connection will likely be logged.
 --
 -- @output
 -- 22/tcp open  ssh     syn-ack
+-- 22/tcp open  ssh     syn-ack
 -- | ssh-auth-methods:
 -- |   Supported authentication methods:
 -- |     publickey
--- |_    password
+-- |     password
+-- |   Banner: This is a private system. Use of this system constitutes
+-- |_consent to monitoring.
+--
+-- @xmloutput
+-- <table key="Supported authentication methods">
+--   <elem>publickey</elem>
+--   <elem>password</elem>
+-- </table>
+-- <elem key="Banner">This is a private system. Use of this system constitutes&#xa;consent to monitoring.&#xa;</elem>
 
 author = "Devin Bjelland"
 license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
@@ -38,6 +48,7 @@ function action (host, port)
   local authmethods = helper:list(username)
 
   result["Supported authentication methods"] = authmethods
+  result["Banner"] = helper:banner()
 
   return result
 end