Merge branch 'gc/remote-with-fewer-static-global-variables'

Code clean-up to eventually allow information on remotes defined for an arbitrary repository to be read. * gc/remote-with-fewer-static-global-variables: remote: die if branch is not found in repository remote: remove the_repository->remote_state from static methods remote: use remote_state parameter internally remote: move static variables into per-repository struct t5516: add test case for pushing remote refspecs