add support for mysql2 adapter to dbconsole

[#4532 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

railties/lib/rails/commands/dbconsole.rb

@@ -55,7 +55,7 @@ def find_cmd(*commands)
       end
 
       case config["adapter"]
-      when "mysql"
+      when /^mysql/
         args = {
           'host'      => '--host',
           'port'      => '--port',
@@ -114,4 +114,4 @@ def find_cmd(*commands)
 # Has to set the RAILS_ENV before config/application is required
 if ARGV.first && !ARGV.first.index("-") && env = ARGV.first
   ENV['RAILS_ENV'] = %w(production development test).find { |e| e.index(env) } || env
-end
+end
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