This commit is another isolation refactor, this time for repo fork.
However, I got fed up with the --remote="true|false|prompt" style of
flags and took this opportunity to switch to a set of bool flags:
--remote and --clone
--no-remote and --no-clone
the string args were really non standard and confusing; with only two
bools it was impossible to tell when to prompt.
This commit hacks the existing repo clone tests into something usable by
the new isolated command. It went ok and was less effort than trying to
introduce the same kind of test format as repo view and gist create.
Now supports names such as `PULL-REQUEST-TEMPLATE` (dashes instead of
underscores) and `issue_template.txt` (any file extension, including no
extension), is valid.
First, consolidate the functionality between `pr merge` and `pr
checkout` that resolves the default branch name of the base repo. With
an added bonus, the new approach avoids an API request when one isn't
necessary.
Then, ensure that checking out 3rd-party PRs will result in local branch
name such as `<owner>/<branch>` when the head branch of the repository
matches the default branch of the base repository. We already have had
code in place to take care of this, but it only took effect in the `pr
checkout <number>`-style invocation.
Most endpoints respect this parameter by default. Those that don't will
just ignore it. The `per_page=100` parameter is not added if there is
already a `per_page` parameter specified in the request.
When `{owner}` and `{repo}` strings are found in request path (for REST
requests) or `query` (for GraphQL), they are replaced with values from
the repository of the current working directory.
