Disabled some debug messages in tracings

Added ability to avoid parsing JSON payload when specifying ignore_post_payload_parse = something. This is useful in case of a HTTP post where you do not want to parse it.

Example:
local dirs = ntop.getDirs()
package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
local json = require "dkjson"

-- Use ignore_post_payload_parse BEFORE calling 'require "lua_utils"'
ignore_post_payload_parse = 1
require "lua_utils"

sendHTTPContentTypeHeader('application/json')
local info, pos, err = json.decode(_POST["payload"], 1, nil)

scripts/lua/modules/http_lint.lua

@@ -1581,7 +1581,10 @@ end
 -- #################################################################
 
 if(pragma_once) then
-   parsePOSTpayload()
+   if(ignore_post_payload_parse == nil) then
+    parsePOSTpayload()
+   end
+
    clearNotAllowedParams()
    lintParams()
    pragma_once = 0