Add modular configuration for Robust connectors

We can provide modular ini for connectors...

    look for our configuration in the following places...
      1) in the default ini/-inifile
      2) in the named file (ConfigName) located in the configured directory
            (see Robust[.HG].ini [Start] section for ConfigDirectory)
      3) in the repository named in the connector (ConfigURL)
           In this case, the file will be written into the configured
           directory with the specified

  See example connector/service @ https://github.com/BlueWall/SlipStream
  for testing.

OpenSim/Server/Base/ServerUtils.cs

@@ -33,6 +33,7 @@ using System.Xml.Serialization;
 using System.Text;
 using System.Collections.Generic;
 using log4net;
+using Nini.Config;
 using OpenSim.Framework;
 using OpenMetaverse;
 
@@ -333,5 +334,42 @@ namespace OpenSim.Server.Base
 
             return ret;
         }
+
+        public static IConfig GetConfig(string configFile, string configName)
+        {
+            IConfig config;
+
+            if (File.Exists(configFile))
+            {
+                IConfigSource configsource = new IniConfigSource(configFile);
+                config = configsource.Configs[configName];
+            }
+            else
+                config = null;
+
+            return config;
+        }
+
+        public static IConfigSource LoadInitialConfig(string url)
+        {
+            IConfigSource source = new XmlConfigSource();
+            m_log.InfoFormat("[CONFIG]: {0} is a http:// URI, fetching ...", url);
+
+            // The ini file path is a http URI
+            // Try to read it
+            try
+            {
+                XmlReader r = XmlReader.Create(url);
+                IConfigSource cs = new XmlConfigSource(r);
+                source.Merge(cs);
+            }
+            catch (Exception e)
+            {
+                m_log.FatalFormat("[CONFIG]: Exception reading config from URI {0}\n" + e.ToString(), url);
+                Environment.Exit(1);
+            }
+
+            return source;
+        }
     }
 }

OpenSim/Server/Base/ServicesServerBase.cs

@@ -64,6 +64,12 @@ namespace OpenSim.Server.Base
             get { return m_Config; }
         }
 
+        public string ConfigDirectory
+        {
+            get;
+            private set;
+        }
+
         // Run flag
         //
         private bool m_Running = true;
@@ -153,6 +159,8 @@ namespace OpenSim.Server.Base
                 startupConfig = m_Config.Configs["Startup"];
             }
 
+            ConfigDirectory = startupConfig.GetString("ConfigDirectory", ".");
+
             prompt = startupConfig.GetString("Prompt", prompt);
 
             // Allow derived classes to load config before the console is