* SessionStateModule.cs: If using cookieless sessions add an

    * SessionStateModule.cs: If using cookieless sessions add an
	onbegin request handler that parsers out session ids and rewrites
	the path. Also redirect to a url with an embedded session id if we
	are creating a new cookieless session.
	* SesionInProcHandler.cs:
	* SessionSQLServerHandler.cs:
	* SessionStateServerHandler.cs: Use SessionId::Lookup to lookup session
	ids, don't set the session id cookie anymore. That is handled by
	the SessionStateModule.
	* SessionId.cs: Add method for looking up session ids, add
	some constants.

svn path=/trunk/mcs/; revision=20759