Allow TinyTDS/DBLIB mode to pass down :host/:port config options.

Author: metaskills

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -22,7 +22,6 @@ def self.sqlserver_connection(config) #:nodoc:
       mode = config[:mode].to_s.downcase.underscore.to_sym
       case mode
       when :dblib
-        raise ArgumentError, 'Missing :dataserver configuration.' unless config.has_key?(:dataserver)
         require_library_or_gem 'tiny_tds'
         warn("TinyTds v0.4.3 or higher required. Using #{TinyTds::VERSION}") unless TinyTds::Client.instance_methods.map(&:to_s).include?("active?")
       when :odbc