Merge branch 'js/remote-rename-with-half-configured-remote'

With anticipatory tweaking for remotes defined in ~/.gitconfig
(e.g. "remote.origin.prune" set to true, even though there may or
may not actually be "origin" remote defined in a particular Git
repository), "git remote rename" and other commands misinterpreted
and behaved as if such a non-existing remote actually existed.

* js/remote-rename-with-half-configured-remote:
remote rename: more carefully determine whether a remote is configured
remote rename: demonstrate a bogus "remote exists" bug

diff --cc builtin/fetch.c
Simple merge

diff --cc builtin/remote.c
Simple merge

diff --cc remote.c
Simple merge