简易配置容器数据映射

[songhuangcn]

当前容器的数据映射配置较麻烦，例如 mysql 的：

.base: &base
  {}
.run_options: &run_options
  p: "3306:3306"
  e: "MYSQL_ALLOW_EMPTY_PASSWORD=yes"
  v: "<%= DPM::HOME %>/data/<%= package_name %>/<%= package_tag || 'default' %>:/var/lib/mysql"
.run_args: &run_args
  character-set-server: "utf8mb4"
  collation-server: "utf8mb4_unicode_ci"

希望可以做到 base 项中声明容器的数据路径，然后自动按照约定配置好数据映射，例如实现以下配置能跟上面效果做到一致：

.base: &base
  volume_data: "/var/lib/mysql"
.run_options: &run_options
  p: "3306:3306"
  e: "MYSQL_ALLOW_EMPTY_PASSWORD=yes"
.run_args: &run_args
  character-set-server: "utf8mb4"
  collation-server: "utf8mb4_unicode_ci"