[BUG REPORT] Removing remote branches

[rlizzo]

Describe the bug
A clear and concise description of what the bug is.

Removing a remote does not remove any tracked remote branches

Severity

Select an option:

• Data Corruption / Loss of Any Kind
• Unexpected Behavior, Exceptions or Error Thrown
• Performance Bottleneck

Expected behavior
A clear and concise description of what you expected to happen.

Removing a remote name should remove any tracked branches at the same time. This is required because it is not possible to delete remote branches (which follow the remote/branch_name syntax) via the normal repo.remove_branch() method.