bundlerepo is... going to be difficult to port to an alternate
store because it assumes revlogs for storage and essentially
overlays the contents of a bundle onto a fake revlog-like
primitive. It will be a good test case for our eventual new
Refactoring bundlerepo to make it work with non-revlog storage is
going to be a bit of work. So for now, let's refuse to use the
simple store repo when a bundlerepo is in play.
A new test requirement advertising support for treating bundle
files as repo instances has been added. Some tests have been
made conditional on this feature. Additional tests will be
annotated in subsequent commits.
Having positive opt-in to repo features will be simpler in the
long run because it will allow multiple storage backends to
declare feature support and we won't have to annotate each test
with the set of repo backends that are supported. Again, we'll
probably want better integration between repo features and
tests. But this is the easiest we can do at the moment.