Description of problem:
Run oo-install every time, only change is saved into ~/.openshift/oo-install-cfg.yml, some useless info is still saved in the file, it is a little confused to user, suggest to re-write this file after run oo-install every time.

Version-Release number of selected component (if applicable):
oo-install-ose-2.0b-20131108-2228

How reproducible:
Always

Steps to Reproduce:
1. Following https://access.redhat.com/site/articles/492873 to do the following operation.
$ curl http://oo-install.rhcloud.com/ose-2.0b/ -o oo-install
$ chmod +x ./oo-install
$ ./oo-install -e -a
2. Finish installation using rhsm, and ~/.openshift/oo-install-cfg.yml is generated, here the following info is saved into the file.
Subscription:
  type: rhsm
  rh_username: qa1
  rh_password: xxxx
3. Run oo-install again, the time I selected "none" method.

Actual results:
"none" method is saved into the file, but other info sill are there.
Subscription:
  type: none
  rh_username: qa1
  rh_password: xxxx

This is not a critical issue, and currently does NOT affect it functionality, but if a new file is generated to overwrite the old one, that would be perfect, and not confuse user.


Expected results:
After run oo-install every time, the default config file should be re-write, no previous setting info is seen in the file.

Additional info: