show deps error if new repo has same name as existing repo

[drewbanin]

initially:

repositories:
  - https://github.com/old-org/my-repo.git

later:

repositories:
  - https://github.com/new-org/my-repo.git

dbt deps will try to clone new-org/my-repo into the existing my-repo dir (via old-org), see that the dir already exists, then pull master for old-org/my-repo. DBT should either 1) namespace these repos by org name or 2) show an error in this scenario.

Stopgap is to just delete the dbt_modules dir then run dbt_deps again

[drewbanin]

this generally isn't a problem -- closing