Adjust the output of http-trace and pop3-capabilities to avoid overly long

lines.

scripts/pop3-capabilities.nse

@@ -5,7 +5,7 @@ Retrieves POP3 email server capabilities.
 ---
 -- @output
 -- 110/tcp open  pop3
--- |_ pop3-capabilities:  USER CAPA RESP-CODES UIDL PIPELINING STLS TOP SASL(PLAIN)
+-- |_ pop3-capabilities: USER CAPA RESP-CODES UIDL PIPELINING STLS TOP SASL(PLAIN)
 
 author = "Philip Pickering <pgpickering@gmail.com>"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
@@ -14,16 +14,18 @@ categories = {"default"}
 
 require 'pop3'
 require 'shortport'
+require 'stdnse'
 
 portrule = shortport.port_or_service({110}, "pop3")
 
 action = function(host, port)
   local capa = pop3.capabilities(host, port)
   if capa then 
-     local capstr = ""
+     -- Convert the capabilities table into an array of strings.
+     local capstrings = {}
      local cap, args
      for cap, args in pairs(capa) do
-	capstr = capstr .. " " .. cap
+	local capstr = cap
 	if type(args) == "string" then capstr = capstr .. "(" .. args .. ")" end
 	if type(args) == "table" then
 	   local arg
@@ -33,8 +35,9 @@ action = function(host, port)
 	   end
 	   capstr = string.sub(capstr, 1, #capstr - 1) .. ")"
 	end
+	table.insert(capstrings, capstr)
      end
-     return capstr
+     return stdnse.strjoin(" ", capstrings)
   else
      return "server doesn't support CAPA"
   end