Change how ms-sql NSE scripts run

MS SQL NSE scripts run on database instances, which can be TCP or named
pipes. With this change, all TCP instances on scanned ports will have
script output attached under the port as a portrule script. Named pipe
instances and TCP instances on unscanned ports will be displayed in the
hostrule script output at the end of the host's output. Utility function
mssql.Helper.InitScript makes it easy to write scripts that just work on
a per-instance basis, without bothering where to put the output.
Discovery will be done once per host, regardless of how many scripts are
run, and can be guaranteed to be done before the script's action takes
place.

scripts/ms-sql-ntlm-info.nse

@@ -1,7 +1,6 @@
 local os = require "os"
 local datetime = require "datetime"
 local mssql = require "mssql"
-local shortport = require "shortport"
 local stdnse = require "stdnse"
 local smbauth = require "smbauth"
 local string = require "string"
@@ -46,9 +45,9 @@ author = "Justin Cacak"
 license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
 categories = {"default", "discovery", "safe"}
 
-portrule = shortport.port_or_service(1433, "ms-sql-s")
+dependencies = {"broadcast-ms-sql-discover"}
 
-action = function(host, port)
+local do_action = function(host, port)
 
   local output = stdnse.output_table()
 
@@ -127,3 +126,9 @@ action = function(host, port)
   return output
 
 end
+
+local function process_instance(instance)
+  return do_action(instance.host, instance.port)
+end
+
+action, portrule = mssql.Helper.InitScript(process_instance)