Checkout or update git repos.

    repos must be a list of dicts each with an url and optional with a name
    value.

def checkup_git_repos_legacy(repos, base_dir='~/repos',
                             verbose=False, prefix='', postfix=''):
    '''Checkout or update git repos.

    repos must be a list of dicts each with an url and optional with a name
    value.
    '''
    run(flo('mkdir -p {base_dir}'))
    for repo in repos:
        cur_base_dir = repo.get('base_dir', base_dir)
        checkup_git_repo_legacy(url=repo['url'], name=repo.get('name', None),
                                base_dir=cur_base_dir, verbose=verbose,
                                prefix=prefix, postfix=postfix)