[Creator] Improve process to create base container.

- Set the password
- Install packages of "Development Tools" group.
  - Because few containers are used above packages.
    But, these packages are install to take time.
- Add information of EPEL repository.
  - Because few containers are used above information.
[Creator] Don't install packages of Development Tools and EPEL
repository.

Because I installed these packages into base container at 3e1b407 revision.