Added MySQL to NixOS

svn path=/nixos/trunk/; revision=10306

upstart-jobs/mysql.nix

@@ -0,0 +1,22 @@
+args: with args;
+
+let
+
+cfg = config.services.mysql;
+mysqlService = import ../services/mysql {
+	inherit (pkgs) stdenv mysql;
+	inherit (cfg) port user datadir
+		log_error pid_file;
+};
+
+in
+{
+	name = "mysql";
+	job = "
+description \"MySQL server\"
+
+stop on shutdown
+
+respawn ${mysqlService}/bin/control start
+	";
+}