Previously, a user could only configure a repository within the user
or an organization. With the addition of this plan, a user will be
able to configure another user's repository by entering the user's
name and desired repository.

The error messages for all plans were also updated by using
dictionaries and %s to get the user's name and repo's name, rather
than outputting a static string.

Ran unit tests with and without parameters, and had no errors. 
Manually tested user:chipx86 and repository name:baseconfigs.git,

and it worked with no errors.
When the plan is tested with random inputs for both username and

repo name, we are given the correct error message.