ConfigurationScriptSource doesn't update after switching repository base

[agrare]

When updating a ConfigurationScriptSource to point to a different base repository/fork (e.g. from git@github.com:ManageIQ/manageiq.git to git@github.com:agrare/manageiq.git) the local copy in data/git_repos/:git_repository_id continues to point to the old repository remote.

Steps to reproduce:

1. Create a Workflows Repository pointing to git@github.com:ManageIQ/workflows-examples.git branch: master
2. Allow it to sync
3. Edit the repository setting the scm_url to a fork that has a branch that doesn't exist on the ManageIQ remote, e.g. git@github.com:agrare/workflows-examples.git branch: test
4. The sync will fail with a missing ref even though git_repository.update_repo was called first

[agrare]

cc @kbrock