Use stdnse.silent_require where needed.

This is required for scripts that require "openssl", but also
transitively for script that require a library that requires "openssl".

scripts/bitcoin-getaddr.nse

@@ -22,9 +22,10 @@ license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"discovery", "safe"}
 
 require 'shortport'
-require 'bitcoin'
 require 'tab'
 require 'target'
+require 'stdnse'
+stdnse.silent_require('bitcoin')
 
 --
 -- Version 0.1

scripts/bittorrent-discovery.nse

@@ -39,9 +39,9 @@ author = "Gorjan Petrovski"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"discovery","safe"}
 
-require "bittorrent"
-require "stdnse"
 require "target"
+require 'stdnse'
+stdnse.silent_require('bittorrent')
 
 prerule = function()
     if not stdnse.get_script_args(SCRIPT_NAME..".torrent") and

scripts/broadcast-ping.nse

@@ -49,10 +49,10 @@ categories = {"discovery","safe","broadcast"}
 require "nmap"
 require "stdnse"
 require "packet"
-require "openssl"
 require "bin"
 require "tab"
 require "target"
+stdnse.silent_require("openssl")
 
 prerule = function()
 	if not nmap.is_privileged() then

scripts/http-vuln-cve2010-2861.nse

@@ -49,7 +49,8 @@ require("http")
 require("shortport")
 require("tab")
 require("vulns")
-require("openssl")
+require("stdnse")
+stdnse.silent_require("openssl")
 
 portrule = shortport.http
 

scripts/ipv6-node-info.nse

@@ -29,8 +29,9 @@ author = "David Fifield"
 require("bin")
 require("bit")
 require("dns")
-require("openssl")
+require("stdnse")
 require("packet")
+stdnse.silent_require("openssl")
 
 local ICMPv6_NODEINFOQUERY = 139
 local   ICMPv6_NODEINFOQUERY_IPv6ADDR = 0

scripts/lltd-discovery.nse

@@ -26,7 +26,8 @@ require "bin"
 require "stdnse"
 require "target"
 require "nmap"
-require "openssl"
+require "stdnse"
+stdnse.silent_require("openssl")
 
 prerule = function()
 	if not nmap.is_privileged() then

scripts/mongodb-brute.nse

@@ -17,8 +17,9 @@ Performs brute force password auditing against the MongoDB database.
 --
 
 require 'brute'
-require 'mongodb'
 require 'shortport'
+require 'stdnse'
+stdnse.silent_require('mongodb')
 
 author = "Patrik Karlsson"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"

scripts/mongodb-databases.nse

@@ -40,8 +40,9 @@ categories = {"default", "discovery", "safe"}
 dependencies = {"mongodb-brute"}
 
 require "creds"
-require "mongodb"
 require "shortport"
+require 'stdnse'
+stdnse.silent_require('mongodb')
 
 portrule = shortport.port_or_service({27017}, {"mongodb"})
 

scripts/mongodb-info.nse

@@ -53,8 +53,9 @@ categories = {"default", "discovery", "safe"}
 dependencies = {"mongodb-brute"}
 
 require "creds"
-require "mongodb"
 require "shortport"
+require 'stdnse'
+stdnse.silent_require('mongodb')
 
 local arg_db = stdnse.get_script_args(SCRIPT_NAME .. ".db") or "admin"
 

scripts/rsync-brute.nse

@@ -21,7 +21,8 @@ Performs brute force password auditing against the rsync remote file syncing pro
 
 require 'shortport'
 require 'brute'
-require 'rsync'
+require 'stdnse'
+stdnse.silent_require('rsync')
 
 author = "Patrik Karlsson"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"

scripts/vuze-dht-info.nse

@@ -34,7 +34,8 @@ categories = {"discovery", "safe"}
 
 require 'shortport'
 require 'ipOps'
-require 'vuzedht'
+require 'stdnse'
+stdnse.silent_require('vuzedht')
 
 portrule = function(host, port)
 	local allports = stdnse.get_script_args('vuze-dht-info.allports')