Change the way of generating user_slug for duplicate user names

[Jimmy Chu]

No description provided.

[LiAh Sheep]

user_slug crashed even when they have different email

[LiAh Sheep]

Investigation Result

The issue occurred because the Openshift server is not properly cleared when resetting the Portal db. Openshift currently contains a ghost user named test01, but Portal db doesn’t have that. When Portal asks Openshift to create test01, Openshift returns Error: User 'test01' already registered..

The current behaviour is: Portal adds _1 to the user_slug and sends that over to Openshift for account creation. However, Openshift doesn’t allow non-alphanumeric namespaces: An error occurred during domain creation. Errors: {:namespace=>["Invalid namespace. Namespace must only contain alphanumeric characters."]}. So this bug still has to be resolved, but in another aspect...

So in conclusion, the solution:

1. Remove all ghost users from Openshift DB
2. Remove the underscore from the Openshift namespace, or use another method to generate duplicate user_slugs.

[Jimmy Chu]

Fixed with pull request #59